64128904 has 48 divisors (see below), whose sum is σ = 140460480. Its totient is φ = 26883360.

The previous prime is 64128893. The next prime is 64128917. The reversal of 64128904 is 40982146.

It is a super-2 number, since 2×64128904² = 8225032656482432, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64128904.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 504889 + ... + 505015.

It is an arithmetic number, because the mean of its divisors is an integer number (2926260).

Almost surely, 2^64128904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64128904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70230240).

64128904 is an abundant number, since it is smaller than the sum of its proper divisors (76331576).

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

64128904 is a wasteful number, since it uses less digits than its factorization.

64128904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338 (or 207 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 64128904 is about 8008.0524473807. The cubic root of 64128904 is about 400.2683699037.

The spelling of 64128904 in words is "sixty-four million, one hundred twenty-eight thousand, nine hundred four".