664220802 has 16 divisors (see below), whose sum is σ = 1518219072. Its totient is φ = 189777360.

The previous prime is 664220801. The next prime is 664220803. The reversal of 664220802 is 208022466.

It is an interprime number because it is at equal distance from previous prime (664220801) and next prime (664220803).

It is a self number, because there is not a number n which added to its sum of digits gives 664220802.

It is not an unprimeable number, because it can be changed into a prime (664220801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7907349 + ... + 7907432.

It is an arithmetic number, because the mean of its divisors is an integer number (94888692).

Almost surely, 2^664220802 is an apocalyptic number.

664220802 is an abundant number, since it is smaller than the sum of its proper divisors (853998270).

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

664220802 is a wasteful number, since it uses less digits than its factorization.

664220802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15814793.

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 664220802 is about 25772.4814870435. The cubic root of 664220802 is about 872.5108257757.

The spelling of 664220802 in words is "six hundred sixty-four million, two hundred twenty thousand, eight hundred two".