664073240 has 32 divisors (see below), whose sum is σ = 1495098000. Its totient is φ = 265463424.

The previous prime is 664073231. The next prime is 664073251. The reversal of 664073240 is 42370466.

It is a junction number, because it is equal to n+sod(n) for n = 664073197 and 664073206.

It is a congruent number.

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, 74966 + ... + 83354.

Almost surely, 2^664073240 is an apocalyptic number.

It is an amenable number.

664073240 is an abundant number, since it is smaller than the sum of its proper divisors (831024760).

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

664073240 is a wasteful number, since it uses less digits than its factorization.

664073240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10379 (or 10375 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 32.

The square root of 664073240 is about 25769.6185458768. The cubic root of 664073240 is about 872.4462092217.

The spelling of 664073240 in words is "six hundred sixty-four million, seventy-three thousand, two hundred forty".