66628692 has 36 divisors (see below), whose sum is σ = 181379380. Its totient is φ = 20500992.

The previous prime is 66628691. The next prime is 66628733. The reversal of 66628692 is 29682666.

It can be written as a sum of positive squares in 2 ways, for example, as 26255376 + 40373316 = 5124^2 + 6354^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66628691) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70717 + ... + 71652.

Almost surely, 2^66628692 is an apocalyptic number.

It is an amenable number.

66628692 is an abundant number, since it is smaller than the sum of its proper divisors (114750688).

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

66628692 is a wasteful number, since it uses less digits than its factorization.

66628692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142392 (or 142387 counting only the distinct ones).

The product of its digits is 373248, while the sum is 45.

The square root of 66628692 is about 8162.6400141131. The cubic root of 66628692 is about 405.4031285508.

The spelling of 66628692 in words is "sixty-six million, six hundred twenty-eight thousand, six hundred ninety-two".