665950928 has 40 divisors (see below), whose sum is σ = 1410266880. Its totient is φ = 303275520.

The previous prime is 665950927. The next prime is 665950937. The reversal of 665950928 is 829059566.

665950928 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×665950928² = 886981277008122368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665950927) 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, 31058 + ... + 47921.

It is an arithmetic number, because the mean of its divisors is an integer number (35256672).

Almost surely, 2^665950928 is an apocalyptic number.

665950928 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

665950928 is an abundant number, since it is smaller than the sum of its proper divisors (744315952).

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

665950928 is a wasteful number, since it uses less digits than its factorization.

665950928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79035 (or 79029 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 50.

The square root of 665950928 is about 25806.0250329259. The cubic root of 665950928 is about 873.2677251311.

The spelling of 665950928 in words is "six hundred sixty-five million, nine hundred fifty thousand, nine hundred twenty-eight".