688682012028 has 12 divisors (see below), whose sum is σ = 1606924694760. Its totient is φ = 229560670672.

The previous prime is 688682012009. The next prime is 688682012063. The reversal of 688682012028 is 820210286886.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×688682012028³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28695083823 + ... + 28695083846.

It is an arithmetic number, because the mean of its divisors is an integer number (133910391230).

Almost surely, 2^688682012028 is an apocalyptic number.

It is an amenable number.

688682012028 is an abundant number, since it is smaller than the sum of its proper divisors (918242682732).

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

688682012028 is a wasteful number, since it uses less digits than its factorization.

688682012028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57390167676 (or 57390167674 counting only the distinct ones).

The product of its (nonzero) digits is 1179648, while the sum is 51.

The spelling of 688682012028 in words is "six hundred eighty-eight billion, six hundred eighty-two million, twelve thousand, twenty-eight".