666879928 has 32 divisors (see below), whose sum is σ = 1469003760. Its totient is φ = 279809280.

The previous prime is 666879901. The next prime is 666879929. The reversal of 666879928 is 829978666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666879929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 290325 + ... + 292612.

Almost surely, 2^666879928 is an apocalyptic number.

It is an amenable number.

666879928 is an abundant number, since it is smaller than the sum of its proper divisors (802123832).

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

666879928 is a wasteful number, since it uses less digits than its factorization.

666879928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582967 (or 582963 counting only the distinct ones).

The product of its digits is 15676416, while the sum is 61.

The square root of 666879928 is about 25824.0184324593. The cubic root of 666879928 is about 873.6736052727.

The spelling of 666879928 in words is "six hundred sixty-six million, eight hundred seventy-nine thousand, nine hundred twenty-eight".