64138932 has 96 divisors (see below), whose sum is σ = 195404160. Its totient is φ = 17936640.

The previous prime is 64138891. The next prime is 64138933. The reversal of 64138932 is 23983146.

64138932 is a `hidden beast` number, since 641 + 3 + 8 + 9 + 3 + 2 = 666.

It is a super-2 number, since 2×64138932² = 8227605196201248, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64138933) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13368 + ... + 17520.

It is an arithmetic number, because the mean of its divisors is an integer number (2035460).

Almost surely, 2^64138932 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64138932, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97702080).

64138932 is an abundant number, since it is smaller than the sum of its proper divisors (131265228).

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

64138932 is a wasteful number, since it uses less digits than its factorization.

64138932 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4190 (or 4182 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 64138932 is about 8008.6785426811. The cubic root of 64138932 is about 400.2892324777.

The spelling of 64138932 in words is "sixty-four million, one hundred thirty-eight thousand, nine hundred thirty-two".