305120031540 has 24 divisors (see below), whose sum is σ = 854336088480. Its totient is φ = 81365341728.

The previous prime is 305120031527. The next prime is 305120031547. The reversal of 305120031540 is 45130021503.

It is a self number, because there is not a number n which added to its sum of digits gives 305120031540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (305120031547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2542666870 + ... + 2542666989.

It is an arithmetic number, because the mean of its divisors is an integer number (35597337020).

Almost surely, 2^305120031540 is an apocalyptic number.

305120031540 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

305120031540 is an abundant number, since it is smaller than the sum of its proper divisors (549216056940).

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

305120031540 is a wasteful number, since it uses less digits than its factorization.

305120031540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5085333871 (or 5085333869 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The spelling of 305120031540 in words is "three hundred five billion, one hundred twenty million, thirty-one thousand, five hundred forty".