668402824 has 32 divisors (see below), whose sum is σ = 1331352000. Its totient is φ = 313699392.

The previous prime is 668402809. The next prime is 668402831. The reversal of 668402824 is 428204866.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3604 + ... + 36739.

It is an arithmetic number, because the mean of its divisors is an integer number (41604750).

Almost surely, 2^668402824 is an apocalyptic number.

It is an amenable number.

668402824 is a deficient number, since it is larger than the sum of its proper divisors (662949176).

668402824 is a wasteful number, since it uses less digits than its factorization.

668402824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40477 (or 40473 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 40.

The square root of 668402824 is about 25853.4876564072. The cubic root of 668402824 is about 874.3381439563.

The spelling of 668402824 in words is "six hundred sixty-eight million, four hundred two thousand, eight hundred twenty-four".