668383390 has 16 divisors (see below), whose sum is σ = 1273860432. Its totient is φ = 251626624.

The previous prime is 668383379. The next prime is 668383409. The reversal of 668383390 is 93383866.

It is a self number, because there is not a number n which added to its sum of digits gives 668383390.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1965664 + ... + 1966003.

It is an arithmetic number, because the mean of its divisors is an integer number (79616277).

Almost surely, 2^668383390 is an apocalyptic number.

668383390 is a deficient number, since it is larger than the sum of its proper divisors (605477042).

668383390 is a wasteful number, since it uses less digits than its factorization.

668383390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3931691.

The product of its (nonzero) digits is 559872, while the sum is 46.

The square root of 668383390 is about 25853.1118049646. Note that the first 3 decimals coincide. The cubic root of 668383390 is about 874.3296699984.

The spelling of 668383390 in words is "six hundred sixty-eight million, three hundred eighty-three thousand, three hundred ninety".