309820987820 has 24 divisors (see below), whose sum is σ = 684867447600. Its totient is φ = 117405847872.

The previous prime is 309820987811. The next prime is 309820987837. The reversal of 309820987820 is 28789028903.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 407658815 + ... + 407659574.

It is an arithmetic number, because the mean of its divisors is an integer number (28536143650).

Almost surely, 2^309820987820 is an apocalyptic number.

It is an amenable number.

309820987820 is an abundant number, since it is smaller than the sum of its proper divisors (375046459780).

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

309820987820 is a wasteful number, since it uses less digits than its factorization.

309820987820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 815318417 (or 815318415 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 56.

The spelling of 309820987820 in words is "three hundred nine billion, eight hundred twenty million, nine hundred eighty-seven thousand, eight hundred twenty".