66628874 has 16 divisors (see below), whose sum is σ = 108260712. Its totient is φ = 30571968.

The previous prime is 66628867. The next prime is 66628883. The reversal of 66628874 is 47882666.

It can be written as a sum of positive squares in 4 ways, for example, as 53919649 + 12709225 = 7343^2 + 3565^2 .

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, 2909 + ... + 11904.

Almost surely, 2^66628874 is an apocalyptic number.

66628874 is a deficient number, since it is larger than the sum of its proper divisors (41631838).

66628874 is a wasteful number, since it uses less digits than its factorization.

66628874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15001.

The product of its digits is 774144, while the sum is 47.

The square root of 66628874 is about 8162.6511624594. The cubic root of 66628874 is about 405.4034976776.

The spelling of 66628874 in words is "sixty-six million, six hundred twenty-eight thousand, eight hundred seventy-four".