64981992 has 32 divisors (see below), whose sum is σ = 169519680. Its totient is φ = 20718720.

The previous prime is 64981967. The next prime is 64981993. The reversal of 64981992 is 29918946.

It is not an unprimeable number, because it can be changed into a prime (64981993) by changing a digit.

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, 58309 + ... + 59412.

It is an arithmetic number, because the mean of its divisors is an integer number (5297490).

Almost surely, 2^64981992 is an apocalyptic number.

It is an amenable number.

64981992 is an abundant number, since it is smaller than the sum of its proper divisors (104537688).

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

64981992 is a wasteful number, since it uses less digits than its factorization.

64981992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117753 (or 117749 counting only the distinct ones).

The product of its digits is 279936, while the sum is 48.

The square root of 64981992 is about 8061.1408621857. The cubic root of 64981992 is about 402.0354415425.

The spelling of 64981992 in words is "sixty-four million, nine hundred eighty-one thousand, nine hundred ninety-two".