64645999 has 8 divisors (see below), whose sum is σ = 74234880. Its totient is φ = 55675800.

The previous prime is 64645979. The next prime is 64646027. The reversal of 64645999 is 99954646.

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 64645999 - 2⁵ = 64645967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64645979) 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, 154447 + ... + 154864.

It is an arithmetic number, because the mean of its divisors is an integer number (9279360).

Almost surely, 2^64645999 is an apocalyptic number.

64645999 is a deficient number, since it is larger than the sum of its proper divisors (9588881).

64645999 is a wasteful number, since it uses less digits than its factorization.

64645999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309341.

The product of its digits is 2099520, while the sum is 52.

The square root of 64645999 is about 8040.2735649976. The cubic root of 64645999 is about 401.3413283182.

The spelling of 64645999 in words is "sixty-four million, six hundred forty-five thousand, nine hundred ninety-nine".