64839924 has 18 divisors (see below), whose sum is σ = 163901010. Its totient is φ = 21613296.

The previous prime is 64839923. The next prime is 64839949. The reversal of 64839924 is 42993846.

It can be written as a sum of positive squares in only one way, i.e., 37088100 + 27751824 = 6090^2 + 5268^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 64839924.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64839923) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 900519 + ... + 900590.

Almost surely, 2^64839924 is an apocalyptic number.

It is an amenable number.

64839924 is an abundant number, since it is smaller than the sum of its proper divisors (99061086).

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

64839924 is a wasteful number, since it uses less digits than its factorization.

64839924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1801119 (or 1801114 counting only the distinct ones).

The product of its digits is 373248, while the sum is 45.

The square root of 64839924 is about 8052.3241365459. The cubic root of 64839924 is about 401.7422421300.

The spelling of 64839924 in words is "sixty-four million, eight hundred thirty-nine thousand, nine hundred twenty-four".