663626620 has 24 divisors (see below), whose sum is σ = 1475594064. Its totient is φ = 249835776.

The previous prime is 663626617. The next prime is 663626651. The reversal of 663626620 is 26626366.

It is a self number, because there is not a number n which added to its sum of digits gives 663626620.

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, 975582 + ... + 976261.

It is an arithmetic number, because the mean of its divisors is an integer number (61483086).

Almost surely, 2^663626620 is an apocalyptic number.

It is an amenable number.

663626620 is an abundant number, since it is smaller than the sum of its proper divisors (811967444).

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

663626620 is a wasteful number, since it uses less digits than its factorization.

663626620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1951869 (or 1951867 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 37.

The square root of 663626620 is about 25760.9514575840. The cubic root of 663626620 is about 872.2505785352.

The spelling of 663626620 in words is "six hundred sixty-three million, six hundred twenty-six thousand, six hundred twenty".