391266664 has 16 divisors (see below), whose sum is σ = 733839300. Its totient is φ = 195576192.

The previous prime is 391266653. The next prime is 391266671. The reversal of 391266664 is 466662193.

It can be written as a sum of positive squares in 2 ways, for example, as 333354564 + 57912100 = 18258^2 + 7610^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 391266664.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41214 + ... + 49810.

Almost surely, 2^391266664 is an apocalyptic number.

It is an amenable number.

391266664 is a deficient number, since it is larger than the sum of its proper divisors (342572636).

391266664 is a wasteful number, since it uses less digits than its factorization.

391266664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14292 (or 14288 counting only the distinct ones).

The product of its digits is 279936, while the sum is 43.

The square root of 391266664 is about 19780.4616730753. The cubic root of 391266664 is about 731.4044794630.

The spelling of 391266664 in words is "three hundred ninety-one million, two hundred sixty-six thousand, six hundred sixty-four".