688934874 has 16 divisors (see below), whose sum is σ = 1387784160. Its totient is φ = 227992560.

The previous prime is 688934867. The next prime is 688934887. The reversal of 688934874 is 478439886.

It is a super-2 number, since 2×688934874² = 949262521226791752, which contains 22 as substring.

It is a Curzon 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, 412197 + ... + 413864.

It is an arithmetic number, because the mean of its divisors is an integer number (86736510).

Almost surely, 2^688934874 is an apocalyptic number.

688934874 is an abundant number, since it is smaller than the sum of its proper divisors (698849286).

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

688934874 is a wasteful number, since it uses less digits than its factorization.

688934874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 826205.

The product of its digits is 9289728, while the sum is 57.

The square root of 688934874 is about 26247.5689159968. The cubic root of 688934874 is about 883.2006698914.

The spelling of 688934874 in words is "six hundred eighty-eight million, nine hundred thirty-four thousand, eight hundred seventy-four".