66891392 has 32 divisors (see below), whose sum is σ = 133660800. Its totient is φ = 33345280.

The previous prime is 66891373. The next prime is 66891403. The reversal of 66891392 is 29319866.

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60767 + ... + 61857.

It is an arithmetic number, because the mean of its divisors is an integer number (4176900).

Almost surely, 2^66891392 is an apocalyptic number.

It is an amenable number.

66891392 is a deficient number, since it is larger than the sum of its proper divisors (66769408).

66891392 is a wasteful number, since it uses less digits than its factorization.

66891392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1584 (or 1572 counting only the distinct ones).

The product of its digits is 139968, while the sum is 44.

The square root of 66891392 is about 8178.7157916142. The cubic root of 66891392 is about 405.9352303514.

The spelling of 66891392 in words is "sixty-six million, eight hundred ninety-one thousand, three hundred ninety-two".