688402 has 32 divisors (see below), whose sum is σ = 1270080. Its totient is φ = 275520.

The previous prime is 688397. The next prime is 688403. The reversal of 688402 is 204886.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (688403) 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, 8253 + ... + 8335.

It is an arithmetic number, because the mean of its divisors is an integer number (39690).

2⁶⁸⁸⁴⁰² is an apocalyptic number.

688402 is a deficient number, since it is larger than the sum of its proper divisors (581678).

688402 is a wasteful number, since it uses less digits than its factorization.

688402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138.

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 688402 is about 829.6999457635. The cubic root of 688402 is about 88.2972899902.

The spelling of 688402 in words is "six hundred eighty-eight thousand, four hundred two".