66828400 has 30 divisors (see below), whose sum is σ = 160556192. Its totient is φ = 26731200.

The previous prime is 66828371. The next prime is 66828431. The reversal of 66828400 is 482866.

It is a congruent 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, 83136 + ... + 83935.

Almost surely, 2^66828400 is an apocalyptic number.

It is an amenable number.

66828400 is an abundant number, since it is smaller than the sum of its proper divisors (93727792).

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

66828400 is a wasteful number, since it uses less digits than its factorization.

66828400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167089 (or 167078 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 66828400 is about 8174.8639132404. The cubic root of 66828400 is about 405.8077665022.

The spelling of 66828400 in words is "sixty-six million, eight hundred twenty-eight thousand, four hundred".