307420520 has 128 divisors (see below), whose sum is σ = 811347840. Its totient is φ = 103587840.

The previous prime is 307420493. The next prime is 307420543. The reversal of 307420520 is 25024703.

It is a super-2 number, since 2×307420520² = 189014752234140800, which contains 22 as substring.

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, 545759 + ... + 546321.

It is an arithmetic number, because the mean of its divisors is an integer number (6338655).

Almost surely, 2^307420520 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 307420520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (405673920).

307420520 is an abundant number, since it is smaller than the sum of its proper divisors (503927320).

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

307420520 is a wasteful number, since it uses less digits than its factorization.

307420520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675 (or 671 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 23.

The square root of 307420520 is about 17533.4115334124. The cubic root of 307420520 is about 674.9075465509.

The spelling of 307420520 in words is "three hundred seven million, four hundred twenty thousand, five hundred twenty".