639480984 has 32 divisors (see below), whose sum is σ = 1618944000. Its totient is φ = 210461472.

The previous prime is 639480979. The next prime is 639481069. The reversal of 639480984 is 489084936.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166744 + ... + 170535.

It is an arithmetic number, because the mean of its divisors is an integer number (50592000).

Almost surely, 2^639480984 is an apocalyptic number.

It is an amenable number.

639480984 is an abundant number, since it is smaller than the sum of its proper divisors (979463016).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

639480984 is a wasteful number, since it uses less digits than its factorization.

639480984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337367 (or 337363 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 51.

The square root of 639480984 is about 25287.9612464113. The cubic root of 639480984 is about 861.5408575794.

It can be divided in two parts, 6394 and 80984, that added together give a palindrome (87378).

The spelling of 639480984 in words is "six hundred thirty-nine million, four hundred eighty thousand, nine hundred eighty-four".