306640506 has 32 divisors (see below), whose sum is σ = 646364160. Its totient is φ = 96713136.

The previous prime is 306640501. The next prime is 306640507. The reversal of 306640506 is 605046603.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (306640501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 150265 + ... + 152291.

It is an arithmetic number, because the mean of its divisors is an integer number (20198880).

Almost surely, 2^306640506 is an apocalyptic number.

306640506 is an abundant number, since it is smaller than the sum of its proper divisors (339723654).

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

306640506 is a wasteful number, since it uses less digits than its factorization.

306640506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3378.

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 306640506 is about 17511.1537598183. The cubic root of 306640506 is about 674.3362517823.

The spelling of 306640506 in words is "three hundred six million, six hundred forty thousand, five hundred six".