391129664 has 28 divisors (see below), whose sum is σ = 797129724. Its totient is φ = 190278144.

The previous prime is 391129663. The next prime is 391129681. The reversal of 391129664 is 466921193.

It can be written as a sum of positive squares in 2 ways, for example, as 216678400 + 174451264 = 14720^2 + 13208^2 .

It is not an unprimeable number, because it can be changed into a prime (391129663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80219 + ... + 84954.

Almost surely, 2^391129664 is an apocalyptic number.

It is an amenable number.

391129664 is an abundant number, since it is smaller than the sum of its proper divisors (406000060).

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

391129664 is a wasteful number, since it uses less digits than its factorization.

391129664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165222 (or 165212 counting only the distinct ones).

The product of its digits is 69984, while the sum is 41.

The square root of 391129664 is about 19776.9983566769. The cubic root of 391129664 is about 731.3191036650.

The spelling of 391129664 in words is "three hundred ninety-one million, one hundred twenty-nine thousand, six hundred sixty-four".