660539428 has 12 divisors (see below), whose sum is σ = 1156124032. Its totient is φ = 330218280.

The previous prime is 660539423. The next prime is 660539449. The reversal of 660539428 is 824935066.

It is not an unprimeable number, because it can be changed into a prime (660539423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42901 + ... + 56227.

Almost surely, 2^660539428 is an apocalyptic number.

It is an amenable number.

660539428 is a deficient number, since it is larger than the sum of its proper divisors (495584604).

660539428 is a wasteful number, since it uses less digits than its factorization.

660539428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25722 (or 25720 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 43.

The square root of 660539428 is about 25700.9616162509. The cubic root of 660539428 is about 870.8959053920.

The spelling of 660539428 in words is "six hundred sixty million, five hundred thirty-nine thousand, four hundred twenty-eight".