663870440 has 16 divisors (see below), whose sum is σ = 1493708580. Its totient is φ = 265548160.

The previous prime is 663870439. The next prime is 663870461. The reversal of 663870440 is 44078366.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 615734596 + 48135844 = 24814^2 + 6938^2 .

It is a super-2 number, since 2×663870440² = 881447922211587200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 663870394 and 663870403.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8298341 + ... + 8298420.

Almost surely, 2^663870440 is an apocalyptic number.

It is an amenable number.

663870440 is an abundant number, since it is smaller than the sum of its proper divisors (829838140).

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

663870440 is a wasteful number, since it uses less digits than its factorization.

663870440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16596772 (or 16596768 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 38.

The square root of 663870440 is about 25765.6833792547. The cubic root of 663870440 is about 872.3573886446.

The spelling of 663870440 in words is "six hundred sixty-three million, eight hundred seventy thousand, four hundred forty".