64949920 has 48 divisors (see below), whose sum is σ = 175367808. Its totient is φ = 22268160.

The previous prime is 64949903. The next prime is 64949957. The reversal of 64949920 is 2994946.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27876 + ... + 30115.

It is an arithmetic number, because the mean of its divisors is an integer number (3653496).

Almost surely, 2^64949920 is an apocalyptic number.

It is an amenable number.

64949920 is an abundant number, since it is smaller than the sum of its proper divisors (110417888).

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

64949920 is a wasteful number, since it uses less digits than its factorization.

64949920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58013 (or 58005 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 64949920 is about 8059.1513200833. The cubic root of 64949920 is about 401.9692888430.

The spelling of 64949920 in words is "sixty-four million, nine hundred forty-nine thousand, nine hundred twenty".