664235244 has 72 divisors (see below), whose sum is σ = 1702995840. Its totient is φ = 218276352.

The previous prime is 664235207. The next prime is 664235263. The reversal of 664235244 is 442532466.

664235244 = 365² + 366² + ... + 1268².

664235244 is a `hidden beast` number, since 6 + 642 + 3 + 5 + 2 + 4 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 664235199 and 664235208.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1093989 + ... + 1094595.

It is an arithmetic number, because the mean of its divisors is an integer number (23652720).

Almost surely, 2^664235244 is an apocalyptic number.

It is an amenable number.

664235244 is an abundant number, since it is smaller than the sum of its proper divisors (1038760596).

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

664235244 is a wasteful number, since it uses less digits than its factorization.

664235244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999 (or 994 counting only the distinct ones).

The product of its digits is 138240, while the sum is 36.

The square root of 664235244 is about 25772.7616680867. The cubic root of 664235244 is about 872.5171493305.

The spelling of 664235244 in words is "six hundred sixty-four million, two hundred thirty-five thousand, two hundred forty-four".