639340875 has 24 divisors (see below), whose sum is σ = 1152520512. Its totient is φ = 340981200.

The previous prime is 639340837. The next prime is 639340903. The reversal of 639340875 is 578043936.

639340875 is a `hidden beast` number, since 639 + 3 + 4 + 0 + 8 + 7 + 5 = 666.

It is not a de Polignac number, because 639340875 - 2⁸ = 639340619 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 639340875.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 283027 + ... + 285276.

It is an arithmetic number, because the mean of its divisors is an integer number (48021688).

Almost surely, 2^639340875 is an apocalyptic number.

639340875 is a deficient number, since it is larger than the sum of its proper divisors (513179637).

639340875 is a wasteful number, since it uses less digits than its factorization.

639340875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568324 (or 568311 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The square root of 639340875 is about 25285.1908238795. The cubic root of 639340875 is about 861.4779323593.

The spelling of 639340875 in words is "six hundred thirty-nine million, three hundred forty thousand, eight hundred seventy-five".