64128976 has 20 divisors (see below), whose sum is σ = 128535300. Its totient is φ = 30958592.

The previous prime is 64128973. The next prime is 64128989. The reversal of 64128976 is 67982146.

64128976 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 26625600 + 37503376 = 5160^2 + 6124^2 .

It is a super-2 number, since 2×64128976² = 8225051125617152, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64128973) 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 3 ways as a sum of consecutive naturals, for example, 68641 + ... + 69568.

It is an arithmetic number, because the mean of its divisors is an integer number (6426765).

Almost surely, 2^64128976 is an apocalyptic number.

It is an amenable number.

64128976 is an abundant number, since it is smaller than the sum of its proper divisors (64406324).

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

64128976 is a wasteful number, since it uses less digits than its factorization.

64128976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138246 (or 138240 counting only the distinct ones).

The product of its digits is 145152, while the sum is 43.

The square root of 64128976 is about 8008.0569428545. The cubic root of 64128976 is about 400.2685197026.

The spelling of 64128976 in words is "sixty-four million, one hundred twenty-eight thousand, nine hundred seventy-six".