663621876 has 24 divisors (see below), whose sum is σ = 1720501440. Its totient is φ = 221207256.

The previous prime is 663621823. The next prime is 663621913. The reversal of 663621876 is 678126366.

663621876 is a `hidden beast` number, since 6 + 636 + 2 + 1 + 8 + 7 + 6 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

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, 3072216 + ... + 3072431.

It is an arithmetic number, because the mean of its divisors is an integer number (71687560).

Almost surely, 2^663621876 is an apocalyptic number.

It is an amenable number.

663621876 is an abundant number, since it is smaller than the sum of its proper divisors (1056879564).

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

663621876 is a wasteful number, since it uses less digits than its factorization.

663621876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6144660 (or 6144652 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 663621876 is about 25760.8593800750. The cubic root of 663621876 is about 872.2485000739.

The spelling of 663621876 in words is "six hundred sixty-three million, six hundred twenty-one thousand, eight hundred seventy-six".