666515628 has 30 divisors (see below), whose sum is σ = 1742404356. Its totient is φ = 222171768.

The previous prime is 666515627. The next prime is 666515677. The reversal of 666515628 is 826515666.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (666515621) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1028250 + ... + 1028897.

Almost surely, 2^666515628 is an apocalyptic number.

It is an amenable number.

666515628 is an abundant number, since it is smaller than the sum of its proper divisors (1075888728).

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

666515628 is a wasteful number, since it uses less digits than its factorization.

666515628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2057163 (or 2057152 counting only the distinct ones).

The product of its digits is 518400, while the sum is 45.

The square root of 666515628 is about 25816.9639578321. The cubic root of 666515628 is about 873.5144875392.

The spelling of 666515628 in words is "six hundred sixty-six million, five hundred fifteen thousand, six hundred twenty-eight".