64628725 has 24 divisors (see below), whose sum is σ = 92861120. Its totient is φ = 43701120.

The previous prime is 64628723. The next prime is 64628779. The reversal of 64628725 is 52782646.

It is not a de Polignac number, because 64628725 - 2¹ = 64628723 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64628723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10246 + ... + 15304.

Almost surely, 2^64628725 is an apocalyptic number.

It is an amenable number.

64628725 is a deficient number, since it is larger than the sum of its proper divisors (28232395).

64628725 is a wasteful number, since it uses less digits than its factorization.

64628725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5149 (or 5144 counting only the distinct ones).

The product of its digits is 161280, while the sum is 40.

The square root of 64628725 is about 8039.1992760473. The cubic root of 64628725 is about 401.3055777804.

The spelling of 64628725 in words is "sixty-four million, six hundred twenty-eight thousand, seven hundred twenty-five".