66900788 has 12 divisors (see below), whose sum is σ = 117160260. Its totient is φ = 33426432.

The previous prime is 66900751. The next prime is 66900817. The reversal of 66900788 is 88700966.

It can be written as a sum of positive squares in 2 ways, for example, as 19731364 + 47169424 = 4442^2 + 6868^2 .

It is a congruent number.

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, 1268 + ... + 11636.

It is an arithmetic number, because the mean of its divisors is an integer number (9763355).

Almost surely, 2^66900788 is an apocalyptic number.

It is an amenable number.

66900788 is a deficient number, since it is larger than the sum of its proper divisors (50259472).

66900788 is a wasteful number, since it uses less digits than its factorization.

66900788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11986 (or 11984 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 66900788 is about 8179.2901892524. The cubic root of 66900788 is about 405.9542362292.

The spelling of 66900788 in words is "sixty-six million, nine hundred thousand, seven hundred eighty-eight".