64265640 has 32 divisors (see below), whose sum is σ = 192797280. Its totient is φ = 17137472.

The previous prime is 64265629. The next prime is 64265659. The reversal of 64265640 is 4656246.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 267654 + ... + 267893.

It is an arithmetic number, because the mean of its divisors is an integer number (6024915).

Almost surely, 2^64265640 is an apocalyptic number.

64265640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64265640 is an abundant number, since it is smaller than the sum of its proper divisors (128531640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64265640 is a wasteful number, since it uses less digits than its factorization.

64265640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535561 (or 535557 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 64265640 is about 8016.5853079725. The cubic root of 64265640 is about 400.5526527524.

The spelling of 64265640 in words is "sixty-four million, two hundred sixty-five thousand, six hundred forty".