668860402 has 32 divisors (see below), whose sum is σ = 1189085184. Its totient is φ = 276123600.

The previous prime is 668860369. The next prime is 668860411. The reversal of 668860402 is 204068866.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93327 + ... + 100237.

It is an arithmetic number, because the mean of its divisors is an integer number (37158912).

Almost surely, 2^668860402 is an apocalyptic number.

668860402 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

668860402 is a deficient number, since it is larger than the sum of its proper divisors (520224782).

668860402 is a wasteful number, since it uses less digits than its factorization.

668860402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7174.

The product of its (nonzero) digits is 110592, while the sum is 40.

The square root of 668860402 is about 25862.3355867176. The cubic root of 668860402 is about 874.5376177985.

The spelling of 668860402 in words is "six hundred sixty-eight million, eight hundred sixty thousand, four hundred two".