64138532 has 24 divisors (see below), whose sum is σ = 113615712. Its totient is φ = 31680000.

The previous prime is 64138523. The next prime is 64138537. The reversal of 64138532 is 23583146.

64138532 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×64138532² = 8227502574230048, which contains 22 as substring.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (64138537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 193607 + ... + 193937.

It is an arithmetic number, because the mean of its divisors is an integer number (4733988).

Almost surely, 2^64138532 is an apocalyptic number.

It is an amenable number.

64138532 is a deficient number, since it is larger than the sum of its proper divisors (49477180).

64138532 is a wasteful number, since it uses less digits than its factorization.

64138532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779 (or 777 counting only the distinct ones).

The product of its digits is 17280, while the sum is 32.

The square root of 64138532 is about 8008.6535697332. The cubic root of 64138532 is about 400.2884003465.

The spelling of 64138532 in words is "sixty-four million, one hundred thirty-eight thousand, five hundred thirty-two".