64731985 has 8 divisors (see below), whose sum is σ = 79485120. Its totient is φ = 50581104.

The previous prime is 64731977. The next prime is 64731991. The reversal of 64731985 is 58913746.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64731985 - 2³ = 64731977 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150325 + ... + 150754.

It is an arithmetic number, because the mean of its divisors is an integer number (9935640).

Almost surely, 2^64731985 is an apocalyptic number.

It is an amenable number.

64731985 is a deficient number, since it is larger than the sum of its proper divisors (14753135).

64731985 is a wasteful number, since it uses less digits than its factorization.

64731985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301127.

The product of its digits is 181440, while the sum is 43.

The square root of 64731985 is about 8045.6189942105. The cubic root of 64731985 is about 401.5191915877.

The spelling of 64731985 in words is "sixty-four million, seven hundred thirty-one thousand, nine hundred eighty-five".