64992990 has 32 divisors (see below), whose sum is σ = 156951936. Its totient is φ = 17223840.

The previous prime is 64992947. The next prime is 64993003. The reversal of 64992990 is 9929946.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1756 + ... + 11535.

It is an arithmetic number, because the mean of its divisors is an integer number (4904748).

Almost surely, 2^64992990 is an apocalyptic number.

64992990 is an abundant number, since it is smaller than the sum of its proper divisors (91958946).

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

64992990 is a wasteful number, since it uses less digits than its factorization.

64992990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13464.

The product of its (nonzero) digits is 314928, while the sum is 48.

The square root of 64992990 is about 8061.8229948319. The cubic root of 64992990 is about 402.0581213456.

It can be divided in two parts, 649 and 92990, that added together give a palindrome (93639).

The spelling of 64992990 in words is "sixty-four million, nine hundred ninety-two thousand, nine hundred ninety".