640239808176 has 80 divisors (see below), whose sum is σ = 1840282214400. Its totient is φ = 213116346432.

The previous prime is 640239808097. The next prime is 640239808181. The reversal of 640239808176 is 671808932046.

640239808176 is a `hidden beast` number, since 6 + 402 + 3 + 98 + 0 + 81 + 76 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 720016 + ... + 1341231.

It is an arithmetic number, because the mean of its divisors is an integer number (23003527680).

Almost surely, 2^640239808176 is an apocalyptic number.

It is an amenable number.

640239808176 is an abundant number, since it is smaller than the sum of its proper divisors (1200042406224).

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

640239808176 is a wasteful number, since it uses less digits than its factorization.

640239808176 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2061983 (or 2061971 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 54.

The spelling of 640239808176 in words is "six hundred forty billion, two hundred thirty-nine million, eight hundred eight thousand, one hundred seventy-six".