639866462 has 8 divisors (see below), whose sum is σ = 972947856. Its totient is φ = 315550512.

The previous prime is 639866453. The next prime is 639866471. The reversal of 639866462 is 264668936.

639866462 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (639866453) and next prime (639866471).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 639866462.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2191178 + ... + 2191469.

It is an arithmetic number, because the mean of its divisors is an integer number (121618482).

Almost surely, 2^639866462 is an apocalyptic number.

639866462 is a deficient number, since it is larger than the sum of its proper divisors (333081394).

639866462 is a wasteful number, since it uses less digits than its factorization.

639866462 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4382722.

The product of its digits is 2239488, while the sum is 50.

The square root of 639866462 is about 25295.5818671957. The cubic root of 639866462 is about 861.7139345728.

The spelling of 639866462 in words is "six hundred thirty-nine million, eight hundred sixty-six thousand, four hundred sixty-two".