639485025 has 24 divisors (see below), whose sum is σ = 1069172640. Its totient is φ = 337223040.

The previous prime is 639485017. The next prime is 639485027. The reversal of 639485025 is 520584936.

It is not a de Polignac number, because 639485025 - 2³ = 639485017 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (639485027) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 41227 + ... + 54576.

It is an arithmetic number, because the mean of its divisors is an integer number (44548860).

Almost surely, 2^639485025 is an apocalyptic number.

It is an amenable number.

639485025 is a deficient number, since it is larger than the sum of its proper divisors (429687615).

639485025 is a wasteful number, since it uses less digits than its factorization.

639485025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95905 (or 95900 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 42.

The square root of 639485025 is about 25288.0411459646. The cubic root of 639485025 is about 861.5426723215.

It can be divided in two parts, 6394 and 85025, that added together give a palindrome (91419).

The spelling of 639485025 in words is "six hundred thirty-nine million, four hundred eighty-five thousand, twenty-five".