663436240 has 40 divisors (see below), whose sum is σ = 1546999200. Its totient is φ = 264598656.

The previous prime is 663436229. The next prime is 663436247. The reversal of 663436240 is 42634366.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 663436196 and 663436205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663436247) 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, 15811 + ... + 39709.

It is an arithmetic number, because the mean of its divisors is an integer number (38674980).

Almost surely, 2^663436240 is an apocalyptic number.

It is an amenable number.

663436240 is an abundant number, since it is smaller than the sum of its proper divisors (883562960).

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

663436240 is a wasteful number, since it uses less digits than its factorization.

663436240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24259 (or 24253 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 34.

The square root of 663436240 is about 25757.2560650392. The cubic root of 663436240 is about 872.1671606702.

The spelling of 663436240 in words is "six hundred sixty-three million, four hundred thirty-six thousand, two hundred forty".