66878992 has 20 divisors (see below), whose sum is σ = 130151020. Its totient is φ = 33291648.

The previous prime is 66878983. The next prime is 66879011. The reversal of 66878992 is 29987866.

It can be written as a sum of positive squares in 2 ways, for example, as 26378496 + 40500496 = 5136^2 + 6364^2 .

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, 5463 + ... + 12790.

It is an arithmetic number, because the mean of its divisors is an integer number (6507551).

Almost surely, 2^66878992 is an apocalyptic number.

It is an amenable number.

66878992 is a deficient number, since it is larger than the sum of its proper divisors (63272028).

66878992 is a wasteful number, since it uses less digits than its factorization.

66878992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18490 (or 18484 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 55.

The square root of 66878992 is about 8177.9576912576. The cubic root of 66878992 is about 405.9101453703.

The spelling of 66878992 in words is "sixty-six million, eight hundred seventy-eight thousand, nine hundred ninety-two".