66628400 has 30 divisors (see below), whose sum is σ = 160075692. Its totient is φ = 26651200.

The previous prime is 66628381. The next prime is 66628417. The reversal of 66628400 is 482666.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 82886 + ... + 83685.

Almost surely, 2^66628400 is an apocalyptic number.

It is an amenable number.

66628400 is an abundant number, since it is smaller than the sum of its proper divisors (93447292).

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

66628400 is a wasteful number, since it uses less digits than its factorization.

66628400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166589 (or 166578 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 66628400 is about 8162.6221277234. The cubic root of 66628400 is about 405.4025363240.

The spelling of 66628400 in words is "sixty-six million, six hundred twenty-eight thousand, four hundred".