66900800 has 42 divisors (see below), whose sum is σ = 164621718. Its totient is φ = 26759680.

The previous prime is 66900751. The next prime is 66900817. The reversal of 66900800 is 800966.

It can be written as a sum of positive squares in 3 ways, for example, as 53824 + 66846976 = 232^2 + 8176^2 .

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, 19307 + ... + 22506.

Almost surely, 2^66900800 is an apocalyptic number.

It is an amenable number.

66900800 is an abundant number, since it is smaller than the sum of its proper divisors (97720918).

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

66900800 is a wasteful number, since it uses less digits than its factorization.

66900800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41835 (or 41820 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 66900800 is about 8179.2909228123. The cubic root of 66900800 is about 405.9542605012.

The spelling of 66900800 in words is "sixty-six million, nine hundred thousand, eight hundred".