664344140 has 24 divisors (see below), whose sum is σ = 1398781440. Its totient is φ = 265040768.

The previous prime is 664344137. The next prime is 664344157. The reversal of 664344140 is 41443466.

It is a junction number, because it is equal to n+sod(n) for n = 664344097 and 664344106.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35705 + ... + 51024.

It is an arithmetic number, because the mean of its divisors is an integer number (58282560).

Almost surely, 2^664344140 is an apocalyptic number.

It is an amenable number.

664344140 is an abundant number, since it is smaller than the sum of its proper divisors (734437300).

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

664344140 is a wasteful number, since it uses less digits than its factorization.

664344140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87121 (or 87119 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 32.

The square root of 664344140 is about 25774.8741994990. The cubic root of 664344140 is about 872.5648274369.

The spelling of 664344140 in words is "six hundred sixty-four million, three hundred forty-four thousand, one hundred forty".