638250625 has 20 divisors (see below), whose sum is σ = 810681124. Its totient is φ = 502200000.

The previous prime is 638250617. The next prime is 638250631. The reversal of 638250625 is 526052836.

It is a happy number.

It can be written as a sum of positive squares in 10 ways, for example, as 483472144 + 154778481 = 21988^2 + 12441^2 .

It is not a de Polignac number, because 638250625 - 2³ = 638250617 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 29755 + ... + 46495.

Almost surely, 2^638250625 is an apocalyptic number.

It is an amenable number.

638250625 is a deficient number, since it is larger than the sum of its proper divisors (172430499).

638250625 is an equidigital number, since it uses as much as digits as its factorization.

638250625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16822 (or 16807 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 37.

The square root of 638250625 is about 25263.6225628867. The cubic root of 638250625 is about 860.9879690562.

It can be divided in two parts, 6 and 38250625, that added together give a triangular number (38250631 = T₈₇₄₆).

The spelling of 638250625 in words is "six hundred thirty-eight million, two hundred fifty thousand, six hundred twenty-five".