663798840 has 32 divisors (see below), whose sum is σ = 1991396880. Its totient is φ = 177012992.

The previous prime is 663798829. The next prime is 663798841. The reversal of 663798840 is 48897366.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663798841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2765709 + ... + 2765948.

Almost surely, 2^663798840 is an apocalyptic number.

663798840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

663798840 is an abundant number, since it is smaller than the sum of its proper divisors (1327598040).

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

663798840 is a wasteful number, since it uses less digits than its factorization.

663798840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5531671 (or 5531667 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 51.

The square root of 663798840 is about 25764.2938967867. The cubic root of 663798840 is about 872.3260255799.

The spelling of 663798840 in words is "six hundred sixty-three million, seven hundred ninety-eight thousand, eight hundred forty".