309430680 has 128 divisors (see below), whose sum is σ = 1007596800. Its totient is φ = 75566592.

The previous prime is 309430663. The next prime is 309430691. The reversal of 309430680 is 86034903.

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, 216127 + ... + 217553.

It is an arithmetic number, because the mean of its divisors is an integer number (7871850).

Almost surely, 2^309430680 is an apocalyptic number.

309430680 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 309430680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (503798400).

309430680 is an abundant number, since it is smaller than the sum of its proper divisors (698166120).

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

309430680 is a wasteful number, since it uses less digits than its factorization.

309430680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1593 (or 1589 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 309430680 is about 17590.6418302460. The cubic root of 309430680 is about 676.3753794380.

The spelling of 309430680 in words is "three hundred nine million, four hundred thirty thousand, six hundred eighty".