64557402 has 128 divisors (see below), whose sum is σ = 172032000. Its totient is φ = 16003008.

The previous prime is 64557401. The next prime is 64557419. The reversal of 64557402 is 20475546.

64557402 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (64557401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 508263 + ... + 508389.

It is an arithmetic number, because the mean of its divisors is an integer number (1344000).

Almost surely, 2^64557402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64557402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86016000).

64557402 is an abundant number, since it is smaller than the sum of its proper divisors (107474598).

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

64557402 is a wasteful number, since it uses less digits than its factorization.

64557402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185 (or 171 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 33.

The square root of 64557402 is about 8034.7620997762. The cubic root of 64557402 is about 401.1578991066.

The spelling of 64557402 in words is "sixty-four million, five hundred fifty-seven thousand, four hundred two".