70389890 has 32 divisors (see below), whose sum is σ = 132696576. Its totient is φ = 26832960.

The previous prime is 70389887. The next prime is 70389899. The reversal of 70389890 is 9898307.

It is a super-2 number, since 2×70389890² = 9909473228424200, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (70389899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106160 + ... + 106820.

It is an arithmetic number, because the mean of its divisors is an integer number (4146768).

Almost surely, 2^70389890 is an apocalyptic number.

70389890 is a deficient number, since it is larger than the sum of its proper divisors (62306686).

70389890 is a wasteful number, since it uses less digits than its factorization.

70389890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1154.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 70389890 is about 8389.8682945562. The cubic root of 70389890 is about 412.8922794182.

The spelling of 70389890 in words is "seventy million, three hundred eighty-nine thousand, eight hundred ninety".