64331913 has 16 divisors (see below), whose sum is σ = 90607616. Its totient is φ = 40536720.

The previous prime is 64331903. The next prime is 64331923. The reversal of 64331913 is 31913346.

It is an interprime number because it is at equal distance from previous prime (64331903) and next prime (64331923).

It is not a de Polignac number, because 64331913 - 2¹⁴ = 64315529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64331903) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4045 + ... + 12042.

It is an arithmetic number, because the mean of its divisors is an integer number (5662976).

Almost surely, 2^64331913 is an apocalyptic number.

It is an amenable number.

64331913 is a deficient number, since it is larger than the sum of its proper divisors (26275703).

64331913 is a wasteful number, since it uses less digits than its factorization.

64331913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16164.

The product of its digits is 5832, while the sum is 30.

The square root of 64331913 is about 8020.7177359635. The cubic root of 64331913 is about 400.6902934687.

The spelling of 64331913 in words is "sixty-four million, three hundred thirty-one thousand, nine hundred thirteen".