660394872 has 48 divisors (see below), whose sum is σ = 1832201280. Its totient is φ = 214761600.

The previous prime is 660394859. The next prime is 660394877. The reversal of 660394872 is 278493066.

It is a super-2 number, since 2×660394872² = 872242773927792768, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660394877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 108904 + ... + 114807.

It is an arithmetic number, because the mean of its divisors is an integer number (38170860).

Almost surely, 2^660394872 is an apocalyptic number.

It is an amenable number.

660394872 is an abundant number, since it is smaller than the sum of its proper divisors (1171806408).

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

660394872 is a wasteful number, since it uses less digits than its factorization.

660394872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223764 (or 223757 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The square root of 660394872 is about 25698.1491940568. The cubic root of 660394872 is about 870.8323702428.

It can be divided in two parts, 6603 and 94872, that added together give a triangular number (101475 = T₄₅₀).

The spelling of 660394872 in words is "six hundred sixty million, three hundred ninety-four thousand, eight hundred seventy-two".