309030072 has 128 divisors (see below), whose sum is σ = 870912000. Its totient is φ = 90731520.

The previous prime is 309030053. The next prime is 309030083. The reversal of 309030072 is 270030903.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 860629 + ... + 860987.

It is an arithmetic number, because the mean of its divisors is an integer number (6804000).

Almost surely, 2^309030072 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 309030072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (435456000).

309030072 is an abundant number, since it is smaller than the sum of its proper divisors (561881928).

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

309030072 is a wasteful number, since it uses less digits than its factorization.

309030072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501 (or 497 counting only the distinct ones).

The product of its (nonzero) digits is 1134, while the sum is 24.

The square root of 309030072 is about 17579.2511785912. The cubic root of 309030072 is about 676.0833609838.

Adding to 309030072 its reverse (270030903), we get a palindrome (579060975).

The spelling of 309030072 in words is "three hundred nine million, thirty thousand, seventy-two".