306407220 has 96 divisors (see below), whose sum is σ = 986404608. Its totient is φ = 69614592.

The previous prime is 306407203. The next prime is 306407221. The reversal of 306407220 is 22704603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (306407221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 70552 + ... + 74768.

It is an arithmetic number, because the mean of its divisors is an integer number (10275048).

Almost surely, 2^306407220 is an apocalyptic number.

306407220 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 306407220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (493202304).

306407220 is an abundant number, since it is smaller than the sum of its proper divisors (679997388).

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

306407220 is a wasteful number, since it uses less digits than its factorization.

306407220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4409 (or 4407 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 24.

The square root of 306407220 is about 17504.4914236318. The cubic root of 306407220 is about 674.1652011936.

The spelling of 306407220 in words is "three hundred six million, four hundred seven thousand, two hundred twenty".