66728874 has 16 divisors (see below), whose sum is σ = 140482080. Its totient is φ = 21072240.

The previous prime is 66728869. The next prime is 66728887. The reversal of 66728874 is 47882766.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 292557 + ... + 292784.

It is an arithmetic number, because the mean of its divisors is an integer number (8780130).

Almost surely, 2^66728874 is an apocalyptic number.

66728874 is an abundant number, since it is smaller than the sum of its proper divisors (73753206).

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

66728874 is a wasteful number, since it uses less digits than its factorization.

66728874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585365.

The product of its digits is 903168, while the sum is 48.

The square root of 66728874 is about 8168.7743266661. The cubic root of 66728874 is about 405.6062130198.

The spelling of 66728874 in words is "sixty-six million, seven hundred twenty-eight thousand, eight hundred seventy-four".