64456520 has 32 divisors (see below), whose sum is σ = 153559800. Its totient is φ = 24265728.

The previous prime is 64456519. The next prime is 64456541. The reversal of 64456520 is 2565446.

It can be written as a sum of positive squares in 4 ways, for example, as 64224196 + 232324 = 8014^2 + 482^2 .

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, 46715 + ... + 48074.

Almost surely, 2^64456520 is an apocalyptic number.

It is an amenable number.

64456520 is an abundant number, since it is smaller than the sum of its proper divisors (89103280).

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

64456520 is a wasteful number, since it uses less digits than its factorization.

64456520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94817 (or 94813 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 32.

The square root of 64456520 is about 8028.4817991947. The cubic root of 64456520 is about 400.9488308537.

The spelling of 64456520 in words is "sixty-four million, four hundred fifty-six thousand, five hundred twenty".