665358928 has 20 divisors (see below), whose sum is σ = 1388297428. Its totient is φ = 307088640.

The previous prime is 665358913. The next prime is 665359003. The reversal of 665358928 is 829853566.

It can be written as a sum of positive squares in 2 ways, for example, as 149523984 + 515834944 = 12228^2 + 22712^2 .

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1599213 + ... + 1599628.

Almost surely, 2^665358928 is an apocalyptic number.

It is an amenable number.

665358928 is an abundant number, since it is smaller than the sum of its proper divisors (722938500).

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

665358928 is a wasteful number, since it uses less digits than its factorization.

665358928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3198862 (or 3198856 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 52.

The square root of 665358928 is about 25794.5522930715. The cubic root of 665358928 is about 873.0088833576.

The spelling of 665358928 in words is "six hundred sixty-five million, three hundred fifty-eight thousand, nine hundred twenty-eight".