64409720 has 64 divisors (see below), whose sum is σ = 148716000. Its totient is φ = 25100800.

The previous prime is 64409707. The next prime is 64409731. The reversal of 64409720 is 2790446.

It is a super-2 number, since 2×64409720² = 8297224060956800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 432206 + ... + 432354.

Almost surely, 2^64409720 is an apocalyptic number.

It is an amenable number.

64409720 is an abundant number, since it is smaller than the sum of its proper divisors (84306280).

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

64409720 is a wasteful number, since it uses less digits than its factorization.

64409720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368 (or 364 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 64409720 is about 8025.5666466612. The cubic root of 64409720 is about 400.8517682729.

The spelling of 64409720 in words is "sixty-four million, four hundred nine thousand, seven hundred twenty".