663998760 has 48 divisors (see below), whose sum is σ = 2157997140. Its totient is φ = 177066240.

The previous prime is 663998737. The next prime is 663998791. The reversal of 663998760 is 67899366.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 647498916 + 16499844 = 25446^2 + 4062^2 .

It is a junction number, because it is equal to n+sod(n) for n = 663998697 and 663998706.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 921861 + ... + 922580.

Almost surely, 2^663998760 is an apocalyptic number.

663998760 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

663998760 is an abundant number, since it is smaller than the sum of its proper divisors (1493998380).

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

663998760 is a wasteful number, since it uses less digits than its factorization.

663998760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1844458 (or 1844451 counting only the distinct ones).

The product of its (nonzero) digits is 2939328, while the sum is 54.

The square root of 663998760 is about 25768.1733927727. The cubic root of 663998760 is about 872.4135912216.

The spelling of 663998760 in words is "six hundred sixty-three million, nine hundred ninety-eight thousand, seven hundred sixty".