3081205520 has 20 divisors (see below), whose sum is σ = 7163803020. Its totient is φ = 1232482176.

The previous prime is 3081205493. The next prime is 3081205553. The reversal of 3081205520 is 255021803.

It can be written as a sum of positive squares in 2 ways, for example, as 816587776 + 2264617744 = 28576^2 + 47588^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 3081205520.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19257455 + ... + 19257614.

It is an arithmetic number, because the mean of its divisors is an integer number (358190151).

Almost surely, 2^3081205520 is an apocalyptic number.

It is an amenable number.

3081205520 is an abundant number, since it is smaller than the sum of its proper divisors (4082597500).

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

3081205520 is a wasteful number, since it uses less digits than its factorization.

3081205520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38515082 (or 38515076 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 3081205520 is about 55508.6076208006. The cubic root of 3081205520 is about 1455.1470696825.

The spelling of 3081205520 in words is "three billion, eighty-one million, two hundred five thousand, five hundred twenty".