665702128 has 40 divisors (see below), whose sum is σ = 1587447008. Its totient is φ = 263354112.

The previous prime is 665702083. The next prime is 665702129. The reversal of 665702128 is 821207566.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665702129) 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, 227151 + ... + 230062.

Almost surely, 2^665702128 is an apocalyptic number.

It is an amenable number.

665702128 is an abundant number, since it is smaller than the sum of its proper divisors (921744880).

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

665702128 is a wasteful number, since it uses less digits than its factorization.

665702128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457241 (or 457235 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 665702128 is about 25801.2040029143. The cubic root of 665702128 is about 873.1589603239.

The spelling of 665702128 in words is "six hundred sixty-five million, seven hundred two thousand, one hundred twenty-eight".