639924495 has 64 divisors (see below), whose sum is σ = 1204076544. Its totient is φ = 284135040.

The previous prime is 639924457. The next prime is 639924517. The reversal of 639924495 is 594429936.

It is not a de Polignac number, because 639924495 - 2⁹ = 639923983 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1223304 + ... + 1223826.

It is an arithmetic number, because the mean of its divisors is an integer number (18813696).

Almost surely, 2^639924495 is an apocalyptic number.

639924495 is a deficient number, since it is larger than the sum of its proper divisors (564152049).

639924495 is a wasteful number, since it uses less digits than its factorization.

639924495 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852.

The product of its digits is 2099520, while the sum is 51.

The square root of 639924495 is about 25296.7289387383. The cubic root of 639924495 is about 861.7399849734.

The spelling of 639924495 in words is "six hundred thirty-nine million, nine hundred twenty-four thousand, four hundred ninety-five".