664453240 has 32 divisors (see below), whose sum is σ = 1630931760. Its totient is φ = 241619200.

The previous prime is 664453217. The next prime is 664453261. The reversal of 664453240 is 42354466.

It is a junction number, because it is equal to n+sod(n) for n = 664453196 and 664453205.

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, 754621 + ... + 755500.

Almost surely, 2^664453240 is an apocalyptic number.

It is an amenable number.

664453240 is an abundant number, since it is smaller than the sum of its proper divisors (966478520).

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

664453240 is a wasteful number, since it uses less digits than its factorization.

664453240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1510143 (or 1510139 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 34.

The square root of 664453240 is about 25776.9905147983. The cubic root of 664453240 is about 872.6125896363.

The spelling of 664453240 in words is "six hundred sixty-four million, four hundred fifty-three thousand, two hundred forty".