665942928 has 60 divisors (see below), whose sum is σ = 2001233520. Its totient is φ = 190268736.

The previous prime is 665942911. The next prime is 665942929. The reversal of 665942928 is 829249566.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (665942929) 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, 139218 + ... + 143921.

It is an arithmetic number, because the mean of its divisors is an integer number (33353892).

Almost surely, 2^665942928 is an apocalyptic number.

It is an amenable number.

665942928 is an abundant number, since it is smaller than the sum of its proper divisors (1335290592).

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

665942928 is a wasteful number, since it uses less digits than its factorization.

665942928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283164 (or 283151 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 51.

The square root of 665942928 is about 25805.8700298982. The cubic root of 665942928 is about 873.2642282920.

The spelling of 665942928 in words is "six hundred sixty-five million, nine hundred forty-two thousand, nine hundred twenty-eight".