309485880 has 256 divisors, whose sum is σ = 1140480000. Its totient is φ = 74027520.

The previous prime is 309485873. The next prime is 309485881. The reversal of 309485880 is 88584903.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309485881) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1294801 + ... + 1295039.

It is an arithmetic number, because the mean of its divisors is an integer number (4455000).

Almost surely, 2^309485880 is an apocalyptic number.

309485880 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 309485880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (570240000).

309485880 is an abundant number, since it is smaller than the sum of its proper divisors (830994120).

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

309485880 is a wasteful number, since it uses less digits than its factorization.

309485880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379 (or 369 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The square root of 309485880 is about 17592.2107763635. The cubic root of 309485880 is about 676.4155970629.

The spelling of 309485880 in words is "three hundred nine million, four hundred eighty-five thousand, eight hundred eighty".