64855931 has 8 divisors (see below), whose sum is σ = 76124640. Its totient is φ = 54088128.

The previous prime is 64855909. The next prime is 64856023. The reversal of 64855931 is 13955846.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64855931 is a prime.

It is a super-2 number, since 2×64855931² = 8412583571753522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64855031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124946 + ... + 125463.

It is an arithmetic number, because the mean of its divisors is an integer number (9515580).

Almost surely, 2^64855931 is an apocalyptic number.

64855931 is a deficient number, since it is larger than the sum of its proper divisors (11268709).

64855931 is a wasteful number, since it uses less digits than its factorization.

64855931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250453.

The product of its digits is 129600, while the sum is 41.

The square root of 64855931 is about 8053.3180118508. The cubic root of 64855931 is about 401.7752987129.

The spelling of 64855931 in words is "sixty-four million, eight hundred fifty-five thousand, nine hundred thirty-one".