639716325 has 48 divisors (see below), whose sum is σ = 1082668800. Its totient is φ = 333216000.

The previous prime is 639716323. The next prime is 639716353. The reversal of 639716325 is 523617936.

It is not a de Polignac number, because 639716325 - 2¹ = 639716323 is a prime.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639716321) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 597891 + ... + 598959.

It is an arithmetic number, because the mean of its divisors is an integer number (22555600).

Almost surely, 2^639716325 is an apocalyptic number.

It is an amenable number.

639716325 is a deficient number, since it is larger than the sum of its proper divisors (442952475).

639716325 is a wasteful number, since it uses less digits than its factorization.

639716325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1262 (or 1257 counting only the distinct ones).

The product of its digits is 204120, while the sum is 42.

The square root of 639716325 is about 25292.6140404664. The cubic root of 639716325 is about 861.6465323502.

It can be divided in two parts, 6397 and 16325, that added together give a palindrome (22722).

The spelling of 639716325 in words is "six hundred thirty-nine million, seven hundred sixteen thousand, three hundred twenty-five".