64891328 has 28 divisors (see below), whose sum is σ = 133212840. Its totient is φ = 31325952.

The previous prime is 64891279. The next prime is 64891361. The reversal of 64891328 is 82319846.

64891328 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

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, 15626 + ... + 19337.

Almost surely, 2^64891328 is an apocalyptic number.

It is an amenable number.

64891328 is an abundant number, since it is smaller than the sum of its proper divisors (68321512).

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

64891328 is a wasteful number, since it uses less digits than its factorization.

64891328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35004 (or 34994 counting only the distinct ones).

The product of its digits is 82944, while the sum is 41.

The square root of 64891328 is about 8055.5153776776. The cubic root of 64891328 is about 401.8483789156.

The spelling of 64891328 in words is "sixty-four million, eight hundred ninety-one thousand, three hundred twenty-eight".