663413640 has 128 divisors (see below), whose sum is σ = 2070835200. Its totient is φ = 169839360.

The previous prime is 663413617. The next prime is 663413711. The reversal of 663413640 is 46314366.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 516439 + ... + 517721.

It is an arithmetic number, because the mean of its divisors is an integer number (16178400).

Almost surely, 2^663413640 is an apocalyptic number.

663413640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 663413640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1035417600).

663413640 is an abundant number, since it is smaller than the sum of its proper divisors (1407421560).

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

663413640 is a wasteful number, since it uses less digits than its factorization.

663413640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1467 (or 1463 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 33.

The square root of 663413640 is about 25756.8173499755. The cubic root of 663413640 is about 872.1572570802.

The spelling of 663413640 in words is "six hundred sixty-three million, four hundred thirteen thousand, six hundred forty".