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290809885 = 558161977
BaseRepresentation
bin10001010101010…
…110100000011101
3202021012200011111
4101111112200131
51043421404020
644505022021
710130562142
oct2125264035
9667180144
10290809885
1113a177853
1281484911
1348330a72
142a8a03c9
151a7e5d5a
hex1155681d

290809885 has 4 divisors (see below), whose sum is σ = 348971868. Its totient is φ = 232647904.

The previous prime is 290809867. The next prime is 290809901. The reversal of 290809885 is 588908092.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 58155876 + 232654009 = 7626^2 + 15253^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-290809885 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29080984 + ... + 29080993.

It is an arithmetic number, because the mean of its divisors is an integer number (87242967).

Almost surely, 2290809885 is an apocalyptic number.

It is an amenable number.

290809885 is a deficient number, since it is larger than the sum of its proper divisors (58161983).

290809885 is an equidigital number, since it uses as much as digits as its factorization.

290809885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58161982.

The product of its (nonzero) digits is 414720, while the sum is 49.

The square root of 290809885 is about 17053.1488294684. The cubic root of 290809885 is about 662.5261961874.

The spelling of 290809885 in words is "two hundred ninety million, eight hundred nine thousand, eight hundred eighty-five".

Divisors: 1 5 58161977 290809885