66331528 has 32 divisors (see below), whose sum is σ = 128352600. Its totient is φ = 32113152.

The previous prime is 66331513. The next prime is 66331543. The reversal of 66331528 is 82513366.

It is an interprime number because it is at equal distance from previous prime (66331513) and next prime (66331543).

It can be written as a sum of positive squares in 4 ways, for example, as 65254084 + 1077444 = 8078^2 + 1038^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66331493 and 66331502.

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, 81588 + ... + 82396.

Almost surely, 2^66331528 is an apocalyptic number.

It is an amenable number.

66331528 is a deficient number, since it is larger than the sum of its proper divisors (62021072).

66331528 is a wasteful number, since it uses less digits than its factorization.

66331528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1129 (or 1125 counting only the distinct ones).

The product of its digits is 25920, while the sum is 34.

The square root of 66331528 is about 8144.4169834310. The cubic root of 66331528 is about 404.7995309248.

The spelling of 66331528 in words is "sixty-six million, three hundred thirty-one thousand, five hundred twenty-eight".