668609070 has 32 divisors (see below), whose sum is σ = 1605363840. Its totient is φ = 178217760.

The previous prime is 668609047. The next prime is 668609087. The reversal of 668609070 is 70906866.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106725 + ... + 112815.

It is an arithmetic number, because the mean of its divisors is an integer number (50167620).

Almost surely, 2^668609070 is an apocalyptic number.

668609070 is an abundant number, since it is smaller than the sum of its proper divisors (936754770).

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

668609070 is a wasteful number, since it uses less digits than its factorization.

668609070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9760.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 668609070 is about 25857.4760949324. The cubic root of 668609070 is about 874.4280648812.

The spelling of 668609070 in words is "six hundred sixty-eight million, six hundred nine thousand, seventy".