64990128 has 40 divisors (see below), whose sum is σ = 191876608. Its totient is φ = 18568512.

The previous prime is 64990109. The next prime is 64990139. The reversal of 64990128 is 82109946.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96376 + ... + 97047.

Almost surely, 2^64990128 is an apocalyptic number.

It is an amenable number.

64990128 is an abundant number, since it is smaller than the sum of its proper divisors (126886480).

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

64990128 is a wasteful number, since it uses less digits than its factorization.

64990128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193441 (or 193435 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 64990128 is about 8061.6454896007. The cubic root of 64990128 is about 402.0522196464.

The spelling of 64990128 in words is "sixty-four million, nine hundred ninety thousand, one hundred twenty-eight".