665307870 has 32 divisors (see below), whose sum is σ = 1597736448. Its totient is φ = 177304608.

The previous prime is 665307827. The next prime is 665307899. The reversal of 665307870 is 78703566.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49407 + ... + 61413.

It is an arithmetic number, because the mean of its divisors is an integer number (49929264).

Almost surely, 2^665307870 is an apocalyptic number.

665307870 is an abundant number, since it is smaller than the sum of its proper divisors (932428578).

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

665307870 is a wasteful number, since it uses less digits than its factorization.

665307870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13864.

The product of its (nonzero) digits is 211680, while the sum is 42.

The square root of 665307870 is about 25793.5625689822. The cubic root of 665307870 is about 872.9865519382.

The spelling of 665307870 in words is "six hundred sixty-five million, three hundred seven thousand, eight hundred seventy".