66727688 has 8 divisors (see below), whose sum is σ = 125114430. Its totient is φ = 33363840.

The previous prime is 66727667. The next prime is 66727693. The reversal of 66727688 is 88672766.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 66552964 + 174724 = 8158^2 + 418^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4170473 + ... + 4170488.

Almost surely, 2^66727688 is an apocalyptic number.

It is an amenable number.

66727688 is a deficient number, since it is larger than the sum of its proper divisors (58386742).

66727688 is a wasteful number, since it uses less digits than its factorization.

66727688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8340967 (or 8340963 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 50.

The square root of 66727688 is about 8168.7017328337. The cubic root of 66727688 is about 405.6038100030.

The spelling of 66727688 in words is "sixty-six million, seven hundred twenty-seven thousand, six hundred eighty-eight".