64256331 has 4 divisors (see below), whose sum is σ = 85675112. Its totient is φ = 42837552.

The previous prime is 64256327. The next prime is 64256351. The reversal of 64256331 is 13365246.

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

It is not a de Polignac number, because 64256331 - 2² = 64256327 is a prime.

It is a super-2 number, since 2×64256331² = 8257752147163122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64256321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10709386 + ... + 10709391.

It is an arithmetic number, because the mean of its divisors is an integer number (21418778).

Almost surely, 2^64256331 is an apocalyptic number.

64256331 is a deficient number, since it is larger than the sum of its proper divisors (21418781).

64256331 is a wasteful number, since it uses less digits than its factorization.

64256331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21418780.

The product of its digits is 12960, while the sum is 30.

The square root of 64256331 is about 8016.0046781423. The cubic root of 64256331 is about 400.5333115476.

The spelling of 64256331 in words is "sixty-four million, two hundred fifty-six thousand, three hundred thirty-one".