64138625 has 8 divisors (see below), whose sum is σ = 80045160. Its totient is φ = 51310800.

The previous prime is 64138621. The next prime is 64138663. The reversal of 64138625 is 52683146.

64138625 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 20367169 + 43771456 = 4513^2 + 6616^2 .

It is not a de Polignac number, because 64138625 - 2² = 64138621 is a prime.

It is a super-2 number, since 2×64138625² = 8227526433781250, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64138621) 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, 256430 + ... + 256679.

It is an arithmetic number, because the mean of its divisors is an integer number (10005645).

Almost surely, 2^64138625 is an apocalyptic number.

It is an amenable number.

64138625 is a deficient number, since it is larger than the sum of its proper divisors (15906535).

64138625 is an equidigital number, since it uses as much as digits as its factorization.

64138625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513124 (or 513114 counting only the distinct ones).

The product of its digits is 34560, while the sum is 35.

The square root of 64138625 is about 8008.6593759505. The cubic root of 64138625 is about 400.2885938173.

The spelling of 64138625 in words is "sixty-four million, one hundred thirty-eight thousand, six hundred twenty-five".