309668868 has 36 divisors (see below), whose sum is σ = 783307980. Its totient is φ = 103152576.

The previous prime is 309668851. The next prime is 309668869. The reversal of 309668868 is 868866903.

It can be written as a sum of positive squares in 2 ways, for example, as 166100544 + 143568324 = 12888^2 + 11982^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (309668869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 103246 + ... + 106202.

It is an arithmetic number, because the mean of its divisors is an integer number (21758555).

Almost surely, 2^309668868 is an apocalyptic number.

It is an amenable number.

309668868 is an abundant number, since it is smaller than the sum of its proper divisors (473639112).

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

309668868 is a wasteful number, since it uses less digits than its factorization.

309668868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5876 (or 5871 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 54.

The square root of 309668868 is about 17597.4108322787. The cubic root of 309668868 is about 676.5488842966.

The spelling of 309668868 in words is "three hundred nine million, six hundred sixty-eight thousand, eight hundred sixty-eight".