638462725 has 6 divisors (see below), whose sum is σ = 791693810. Its totient is φ = 510770160.

The previous prime is 638462689. The next prime is 638462729. The reversal of 638462725 is 527264836.

It can be written as a sum of positive squares in 3 ways, for example, as 2313441 + 636149284 = 1521^2 + 25222^2 .

It is not a de Polignac number, because 638462725 - 2⁷ = 638462597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638462729) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12769230 + ... + 12769279.

Almost surely, 2^638462725 is an apocalyptic number.

It is an amenable number.

638462725 is a deficient number, since it is larger than the sum of its proper divisors (153231085).

638462725 is a wasteful number, since it uses less digits than its factorization.

638462725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25538519 (or 25538514 counting only the distinct ones).

The product of its digits is 483840, while the sum is 43.

The square root of 638462725 is about 25267.8199494931. The cubic root of 638462725 is about 861.0833314505.

The spelling of 638462725 in words is "six hundred thirty-eight million, four hundred sixty-two thousand, seven hundred twenty-five".