305145320 has 32 divisors (see below), whose sum is σ = 722714400. Its totient is φ = 115633728.

The previous prime is 305145319. The next prime is 305145331. The reversal of 305145320 is 23541503.

It is a super-2 number, since 2×305145320² = 186227332635804800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199994 + ... + 201513.

It is an arithmetic number, because the mean of its divisors is an integer number (22584825).

Almost surely, 2^305145320 is an apocalyptic number.

It is an amenable number.

305145320 is an abundant number, since it is smaller than the sum of its proper divisors (417569080).

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

305145320 is a wasteful number, since it uses less digits than its factorization.

305145320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401537 (or 401533 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 305145320 is about 17468.4092006113. The cubic root of 305145320 is about 673.2384392842.

Adding to 305145320 its reverse (23541503), we get a palindrome (328686823).

The spelling of 305145320 in words is "three hundred five million, one hundred forty-five thousand, three hundred twenty".