688660704408 has 64 divisors (see below), whose sum is σ = 1812503865600. Its totient is φ = 217443139200.

The previous prime is 688660704401. The next prime is 688660704409. The reversal of 688660704408 is 804407066886.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688660704401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3507285 + ... + 3698427.

It is an arithmetic number, because the mean of its divisors is an integer number (28320372900).

Almost surely, 2^688660704408 is an apocalyptic number.

It is an amenable number.

688660704408 is an abundant number, since it is smaller than the sum of its proper divisors (1123843161192).

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

688660704408 is a wasteful number, since it uses less digits than its factorization.

688660704408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199072 (or 199068 counting only the distinct ones).

The product of its (nonzero) digits is 12386304, while the sum is 57.

The spelling of 688660704408 in words is "six hundred eighty-eight billion, six hundred sixty million, seven hundred four thousand, four hundred eight".