668854728 has 48 divisors (see below), whose sum is σ = 1815886800. Its totient is φ = 222409440.

The previous prime is 668854717. The next prime is 668854733. The reversal of 668854728 is 827458866.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19083 + ... + 41253.

It is an arithmetic number, because the mean of its divisors is an integer number (37830975).

Almost surely, 2^668854728 is an apocalyptic number.

It is an amenable number.

668854728 is an abundant number, since it is smaller than the sum of its proper divisors (1147032072).

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

668854728 is a wasteful number, since it uses less digits than its factorization.

668854728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22602 (or 22595 counting only the distinct ones).

The product of its digits is 5160960, while the sum is 54.

The square root of 668854728 is about 25862.2258902825. The cubic root of 668854728 is about 874.5351448657.

It can be divided in two parts, 6688 and 54728, that added together give a palindrome (61416).

The spelling of 668854728 in words is "six hundred sixty-eight million, eight hundred fifty-four thousand, seven hundred twenty-eight".