668686734 has 24 divisors (see below), whose sum is σ = 1449407232. Its totient is φ = 222805440.

The previous prime is 668686729. The next prime is 668686747. The reversal of 668686734 is 437686866.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50227 + ... + 62129.

It is an arithmetic number, because the mean of its divisors is an integer number (60391968).

Almost surely, 2^668686734 is an apocalyptic number.

668686734 is an abundant number, since it is smaller than the sum of its proper divisors (780720498).

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

668686734 is a wasteful number, since it uses less digits than its factorization.

668686734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15032 (or 15029 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 54.

The square root of 668686734 is about 25858.9778220254. The cubic root of 668686734 is about 874.4619207146.

The spelling of 668686734 in words is "six hundred sixty-eight million, six hundred eighty-six thousand, seven hundred thirty-four".