64240644 has 24 divisors (see below), whose sum is σ = 161425600. Its totient is φ = 19766304.

The previous prime is 64240639. The next prime is 64240651. The reversal of 64240644 is 44604246.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 205744 + ... + 206055.

Almost surely, 2^64240644 is an apocalyptic number.

It is an amenable number.

64240644 is an abundant number, since it is smaller than the sum of its proper divisors (97184956).

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

64240644 is a wasteful number, since it uses less digits than its factorization.

64240644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411819 (or 411817 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 30.

The square root of 64240644 is about 8015.0261384477. The cubic root of 64240644 is about 400.5007146173.

The spelling of 64240644 in words is "sixty-four million, two hundred forty thousand, six hundred forty-four".