306172240 has 80 divisors (see below), whose sum is σ = 789860160. Its totient is φ = 109429760.

The previous prime is 306172219. The next prime is 306172259. The reversal of 306172240 is 42271603.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48972 + ... + 54868.

It is an arithmetic number, because the mean of its divisors is an integer number (9873252).

Almost surely, 2^306172240 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 306172240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (394930080).

306172240 is an abundant number, since it is smaller than the sum of its proper divisors (483687920).

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

306172240 is a wasteful number, since it uses less digits than its factorization.

306172240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5980 (or 5974 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 306172240 is about 17497.7781446674. The cubic root of 306172240 is about 673.9928207344.

The spelling of 306172240 in words is "three hundred six million, one hundred seventy-two thousand, two hundred forty".