305240545720 has 128 divisors (see below), whose sum is σ = 791664192000. Its totient is φ = 104754055680.

The previous prime is 305240545697. The next prime is 305240545763. The reversal of 305240545720 is 27545042503.

It is a self number, because there is not a number n which added to its sum of digits gives 305240545720.

It is a congruent number.

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, 2129266 + ... + 2268094.

It is an arithmetic number, because the mean of its divisors is an integer number (6184876500).

Almost surely, 2^305240545720 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 305240545720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (395832096000).

305240545720 is an abundant number, since it is smaller than the sum of its proper divisors (486423646280).

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

305240545720 is a wasteful number, since it uses less digits than its factorization.

305240545720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139133 (or 139129 counting only the distinct ones).

The product of its (nonzero) digits is 168000, while the sum is 37.

The spelling of 305240545720 in words is "three hundred five billion, two hundred forty million, five hundred forty-five thousand, seven hundred twenty".