64631625 has 16 divisors (see below), whose sum is σ = 107547648. Its totient is φ = 34470000.

The previous prime is 64631599. The next prime is 64631653. The reversal of 64631625 is 52613646.

It is not a de Polignac number, because 64631625 - 2⁶ = 64631561 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85801 + ... + 86550.

It is an arithmetic number, because the mean of its divisors is an integer number (6721728).

Almost surely, 2^64631625 is an apocalyptic number.

It is an amenable number.

64631625 is a deficient number, since it is larger than the sum of its proper divisors (42916023).

64631625 is a wasteful number, since it uses less digits than its factorization.

64631625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172369 (or 172359 counting only the distinct ones).

The product of its digits is 25920, while the sum is 33.

The square root of 64631625 is about 8039.3796402459. The cubic root of 64631625 is about 401.3115801102.

It can be divided in two parts, 64631 and 625, that added together give a palindrome (65256).

The spelling of 64631625 in words is "sixty-four million, six hundred thirty-one thousand, six hundred twenty-five".