668977478 has 16 divisors (see below), whose sum is σ = 1095879456. Its totient is φ = 304409280.

The previous prime is 668977469. The next prime is 668977493. The reversal of 668977478 is 874779866.

It is a self number, because there is not a number n which added to its sum of digits gives 668977478.

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, 179351 + ... + 183042.

It is an arithmetic number, because the mean of its divisors is an integer number (68492466).

Almost surely, 2^668977478 is an apocalyptic number.

668977478 is a deficient number, since it is larger than the sum of its proper divisors (426901978).

668977478 is a wasteful number, since it uses less digits than its factorization.

668977478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362479.

The product of its digits is 28449792, while the sum is 62.

The square root of 668977478 is about 25864.5989336777. The cubic root of 668977478 is about 874.5886405991.

The spelling of 668977478 in words is "six hundred sixty-eight million, nine hundred seventy-seven thousand, four hundred seventy-eight".