688438268 has 24 divisors (see below), whose sum is σ = 1382126592. Its totient is φ = 293919984.

The previous prime is 688438217. The next prime is 688438313. The reversal of 688438268 is 862834886.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39380 + ... + 54107.

It is an arithmetic number, because the mean of its divisors is an integer number (57588608).

Almost surely, 2^688438268 is an apocalyptic number.

It is an amenable number.

688438268 is an abundant number, since it is smaller than the sum of its proper divisors (693688324).

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

688438268 is a wasteful number, since it uses less digits than its factorization.

688438268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93761 (or 93759 counting only the distinct ones).

The product of its digits is 3538944, while the sum is 53.

The square root of 688438268 is about 26238.1071725839. The cubic root of 688438268 is about 882.9884059088.

The spelling of 688438268 in words is "six hundred eighty-eight million, four hundred thirty-eight thousand, two hundred sixty-eight".