309989990256 has 40 divisors (see below), whose sum is σ = 801502160400. Its totient is φ = 103240359936.

The previous prime is 309989990251. The next prime is 309989990257. The reversal of 309989990256 is 652099989903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309989990251) 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, 2745231 + ... + 2855918.

It is an arithmetic number, because the mean of its divisors is an integer number (20037554010).

Almost surely, 2^309989990256 is an apocalyptic number.

It is an amenable number.

309989990256 is an abundant number, since it is smaller than the sum of its proper divisors (491512170144).

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

309989990256 is a wasteful number, since it uses less digits than its factorization.

309989990256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5602313 (or 5602307 counting only the distinct ones).

The product of its (nonzero) digits is 85030560, while the sum is 69.

The spelling of 309989990256 in words is "three hundred nine billion, nine hundred eighty-nine million, nine hundred ninety thousand, two hundred fifty-six".