64564331 has 8 divisors (see below), whose sum is σ = 69706560. Its totient is φ = 59447232.

The previous prime is 64564327. The next prime is 64564333. The reversal of 64564331 is 13346546.

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

It is not a de Polignac number, because 64564331 - 2² = 64564327 is a prime.

It is a super-2 number, since 2×64564331² = 8337105674955122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64564333) 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, 755 + ... + 11388.

It is an arithmetic number, because the mean of its divisors is an integer number (8713320).

Almost surely, 2^64564331 is an apocalyptic number.

64564331 is a deficient number, since it is larger than the sum of its proper divisors (5142229).

64564331 is a wasteful number, since it uses less digits than its factorization.

64564331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12565.

The product of its digits is 25920, while the sum is 32.

The square root of 64564331 is about 8035.1932770780. The cubic root of 64564331 is about 401.1722507975.

The spelling of 64564331 in words is "sixty-four million, five hundred sixty-four thousand, three hundred thirty-one".