390427664 has 20 divisors (see below), whose sum is σ = 825222480. Its totient is φ = 177467040.

The previous prime is 390427657. The next prime is 390427673. The reversal of 390427664 is 466724093.

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, 1108994 + ... + 1109345.

It is an arithmetic number, because the mean of its divisors is an integer number (41261124).

Almost surely, 2^390427664 is an apocalyptic number.

It is an amenable number.

390427664 is an abundant number, since it is smaller than the sum of its proper divisors (434794816).

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

390427664 is a wasteful number, since it uses less digits than its factorization.

390427664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2218358 (or 2218352 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 41.

The square root of 390427664 is about 19759.2424956019. The cubic root of 390427664 is about 730.8813175064.

The spelling of 390427664 in words is "three hundred ninety million, four hundred twenty-seven thousand, six hundred sixty-four".