66989328 has 40 divisors (see below), whose sum is σ = 197779008. Its totient is φ = 19139712.

The previous prime is 66989309. The next prime is 66989353. The reversal of 66989328 is 82398966.

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, 99351 + ... + 100022.

Almost surely, 2^66989328 is an apocalyptic number.

It is an amenable number.

66989328 is an abundant number, since it is smaller than the sum of its proper divisors (130789680).

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

66989328 is a wasteful number, since it uses less digits than its factorization.

66989328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199391 (or 199385 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 51.

The square root of 66989328 is about 8184.7008497562. The cubic root of 66989328 is about 406.1332443018.

The spelling of 66989328 in words is "sixty-six million, nine hundred eighty-nine thousand, three hundred twenty-eight".