309036521216 has 72 divisors (see below), whose sum is σ = 649585448400. Its totient is φ = 146328698880.

The previous prime is 309036521203. The next prime is 309036521231. The reversal of 309036521216 is 612125630903.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 309036521216.

It is a congruent number.

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, 14138456 + ... + 14160296.

Almost surely, 2^309036521216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 309036521216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (324792724200).

309036521216 is an abundant number, since it is smaller than the sum of its proper divisors (340548927184).

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

309036521216 is a wasteful number, since it uses less digits than its factorization.

309036521216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24785 (or 24771 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 38.

The spelling of 309036521216 in words is "three hundred nine billion, thirty-six million, five hundred twenty-one thousand, two hundred sixteen".