64421056 has 28 divisors (see below), whose sum is σ = 146098768. Its totient is φ = 27608832.

The previous prime is 64421017. The next prime is 64421081. The reversal of 64421056 is 65012446.

It is a tau number, because it is divible by the number of its divisors (28).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71451 + ... + 72346.

Almost surely, 2^64421056 is an apocalyptic number.

It is an amenable number.

64421056 is an abundant number, since it is smaller than the sum of its proper divisors (81677712).

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

64421056 is a wasteful number, since it uses less digits than its factorization.

64421056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143816 (or 143806 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 64421056 is about 8026.2728585565. The cubic root of 64421056 is about 400.8752833008.

The spelling of 64421056 in words is "sixty-four million, four hundred twenty-one thousand, fifty-six".