64139424 has 48 divisors (see below), whose sum is σ = 168864192. Its totient is φ = 21316608.

The previous prime is 64139423. The next prime is 64139429. The reversal of 64139424 is 42493146.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×64139424² = 8227731422103552, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64139423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40797 + ... + 42339.

It is an arithmetic number, because the mean of its divisors is an integer number (3518004).

Almost surely, 2^64139424 is an apocalyptic number.

It is an amenable number.

64139424 is an abundant number, since it is smaller than the sum of its proper divisors (104724768).

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

64139424 is a wasteful number, since it uses less digits than its factorization.

64139424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1989 (or 1981 counting only the distinct ones).

The product of its digits is 20736, while the sum is 33.

The square root of 64139424 is about 8008.7092593002. The cubic root of 64139424 is about 400.2902559944.

The spelling of 64139424 in words is "sixty-four million, one hundred thirty-nine thousand, four hundred twenty-four".