688709404980 has 192 divisors, whose sum is σ = 2388095136000. Its totient is φ = 163755012096.

The previous prime is 688709404949. The next prime is 688709405039. The reversal of 688709404980 is 89404907886.

688709404980 is a `hidden beast` number, since 6 + 88 + 70 + 9 + 404 + 9 + 80 = 666.

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, 1799865 + ... + 2148704.

It is an arithmetic number, because the mean of its divisors is an integer number (12437995500).

Almost surely, 2^688709404980 is an apocalyptic number.

688709404980 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

688709404980 is an abundant number, since it is smaller than the sum of its proper divisors (1699385731020).

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

688709404980 is a wasteful number, since it uses less digits than its factorization.

688709404980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3948623 (or 3948615 counting only the distinct ones).

The product of its (nonzero) digits is 27869184, while the sum is 63.

The spelling of 688709404980 in words is "six hundred eighty-eight billion, seven hundred nine million, four hundred four thousand, nine hundred eighty".