64540056 has 48 divisors (see below), whose sum is σ = 187696440. Its totient is φ = 18439680.

The previous prime is 64540043. The next prime is 64540057. The reversal of 64540056 is 65004546.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64540057) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26265 + ... + 28616.

Almost surely, 2^64540056 is an apocalyptic number.

It is an amenable number.

64540056 is an abundant number, since it is smaller than the sum of its proper divisors (123156384).

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

64540056 is a wasteful number, since it uses less digits than its factorization.

64540056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54904 (or 54893 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 64540056 is about 8033.6825926844. The cubic root of 64540056 is about 401.1219667011.

The spelling of 64540056 in words is "sixty-four million, five hundred forty thousand, fifty-six".