66869904 has 20 divisors (see below), whose sum is σ = 172747376. Its totient is φ = 22289952.

The previous prime is 66869879. The next prime is 66869917. The reversal of 66869904 is 40996866.

It is a super-5 number, since 5×66869904⁵ (a number of 40 digits) contains 55555 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 1393123 = 66869904 / (6 + 6 + 8 + 6 + 9 + 9 + 0 + 4).

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, 696514 + ... + 696609.

Almost surely, 2^66869904 is an apocalyptic number.

It is an amenable number.

66869904 is an abundant number, since it is smaller than the sum of its proper divisors (105877472).

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

66869904 is a wasteful number, since it uses less digits than its factorization.

66869904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1393134 (or 1393128 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 48.

The square root of 66869904 is about 8177.4020324306. The cubic root of 66869904 is about 405.8917585376.

The spelling of 66869904 in words is "sixty-six million, eight hundred sixty-nine thousand, nine hundred four".