665879340 has 48 divisors (see below), whose sum is σ = 2130815232. Its totient is φ = 152200896.

The previous prime is 665879317. The next prime is 665879359. The reversal of 665879340 is 43978566.

It is a self number, because there is not a number n which added to its sum of digits gives 665879340.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 792294 + ... + 793133.

It is an arithmetic number, because the mean of its divisors is an integer number (44391984).

Almost surely, 2^665879340 is an apocalyptic number.

665879340 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

665879340 is an abundant number, since it is smaller than the sum of its proper divisors (1464935892).

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

665879340 is a wasteful number, since it uses less digits than its factorization.

665879340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1585446 (or 1585444 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 48.

The square root of 665879340 is about 25804.6379552204. The cubic root of 665879340 is about 873.2364326702.

The spelling of 665879340 in words is "six hundred sixty-five million, eight hundred seventy-nine thousand, three hundred forty".