668808734 has 16 divisors (see below), whose sum is σ = 1096139520. Its totient is φ = 303524760.

The previous prime is 668808733. The next prime is 668808809. The reversal of 668808734 is 437808866.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668808733) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9494 + ... + 37785.

It is an arithmetic number, because the mean of its divisors is an integer number (68508720).

Almost surely, 2^668808734 is an apocalyptic number.

668808734 is a deficient number, since it is larger than the sum of its proper divisors (427330786).

668808734 is a wasteful number, since it uses less digits than its factorization.

668808734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47935.

The product of its (nonzero) digits is 1548288, while the sum is 50.

The square root of 668808734 is about 25861.3366630575. The cubic root of 668808734 is about 874.5150985139.

The spelling of 668808734 in words is "six hundred sixty-eight million, eight hundred eight thousand, seven hundred thirty-four".