663787680 has 48 divisors (see below), whose sum is σ = 2090932704. Its totient is φ = 177009920.

The previous prime is 663787673. The next prime is 663787687. The reversal of 663787680 is 86787366.

It is an interprime number because it is at equal distance from previous prime (663787673) and next prime (663787687).

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×663787680² = 881228168239564800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (663787687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 690966 + ... + 691925.

It is an arithmetic number, because the mean of its divisors is an integer number (43561098).

Almost surely, 2^663787680 is an apocalyptic number.

663787680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

663787680 is an abundant number, since it is smaller than the sum of its proper divisors (1427145024).

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

663787680 is a wasteful number, since it uses less digits than its factorization.

663787680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1382909 (or 1382901 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 51.

The square root of 663787680 is about 25764.0773170708. The cubic root of 663787680 is about 872.3211369438.

The spelling of 663787680 in words is "six hundred sixty-three million, seven hundred eighty-seven thousand, six hundred eighty".