663890380 has 24 divisors (see below), whose sum is σ = 1399325760. Its totient is φ = 264574080.

The previous prime is 663890323. The next prime is 663890393. The reversal of 663890380 is 83098366.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

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, 55825 + ... + 66664.

It is an arithmetic number, because the mean of its divisors is an integer number (58305240).

Almost surely, 2^663890380 is an apocalyptic number.

It is an amenable number.

663890380 is an abundant number, since it is smaller than the sum of its proper divisors (735435380).

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

663890380 is a wasteful number, since it uses less digits than its factorization.

663890380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122769 (or 122767 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 43.

The square root of 663890380 is about 25766.0703251388. The cubic root of 663890380 is about 872.3661225939.

The spelling of 663890380 in words is "six hundred sixty-three million, eight hundred ninety thousand, three hundred eighty".