688691873880 has 128 divisors (see below), whose sum is σ = 2308323326400. Its totient is φ = 182636467200.

The previous prime is 688691873843. The next prime is 688691873899. The reversal of 688691873880 is 88378196886.

688691873880 is a `hidden beast` number, since 6 + 8 + 8 + 69 + 187 + 388 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 688691873799 and 688691873808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1566061 + ... + 1957020.

Almost surely, 2^688691873880 is an apocalyptic number.

688691873880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

688691873880 is an abundant number, since it is smaller than the sum of its proper divisors (1619631452520).

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

688691873880 is a wasteful number, since it uses less digits than its factorization.

688691873880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3523282 (or 3523272 counting only the distinct ones).

The product of its (nonzero) digits is 222953472, while the sum is 72.

The spelling of 688691873880 in words is "six hundred eighty-eight billion, six hundred ninety-one million, eight hundred seventy-three thousand, eight hundred eighty".