309438893628 has 96 divisors (see below), whose sum is σ = 816121931520. Its totient is φ = 101365629120.

The previous prime is 309438893591. The next prime is 309438893641. The reversal of 309438893628 is 826398834903.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7641651 + ... + 7682037.

It is an arithmetic number, because the mean of its divisors is an integer number (8501270120).

Almost surely, 2^309438893628 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 309438893628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (408060965760).

309438893628 is an abundant number, since it is smaller than the sum of its proper divisors (506683037892).

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

309438893628 is a wasteful number, since it uses less digits than its factorization.

309438893628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41624 (or 41616 counting only the distinct ones).

The product of its (nonzero) digits is 53747712, while the sum is 63.

The spelling of 309438893628 in words is "three hundred nine billion, four hundred thirty-eight million, eight hundred ninety-three thousand, six hundred twenty-eight".