639959877 has 24 divisors (see below), whose sum is σ = 957864960. Its totient is φ = 411294240.

The previous prime is 639959869. The next prime is 639959923. The reversal of 639959877 is 778959936.

639959877 is a `hidden beast` number, since 6 + 39 + 9 + 598 + 7 + 7 = 666.

It is not a de Polignac number, because 639959877 - 2³ = 639959869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639959867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 70788 + ... + 79314.

It is an arithmetic number, because the mean of its divisors is an integer number (39911040).

Almost surely, 2^639959877 is an apocalyptic number.

It is an amenable number.

639959877 is a deficient number, since it is larger than the sum of its proper divisors (317905083).

639959877 is a wasteful number, since it uses less digits than its factorization.

639959877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8833 (or 8830 counting only the distinct ones).

The product of its digits is 25719120, while the sum is 63.

The square root of 639959877 is about 25297.4282685019. The cubic root of 639959877 is about 861.7558668066.

The spelling of 639959877 in words is "six hundred thirty-nine million, nine hundred fifty-nine thousand, eight hundred seventy-seven".