2145607728 has 80 divisors (see below), whose sum is σ = 6114787200. Its totient is φ = 642864640.

The previous prime is 2145607703. The next prime is 2145607759. The reversal of 2145607728 is 8277065412.

It is a self number, because there is not a number n which added to its sum of digits gives 2145607728.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24163 + ... + 69821.

It is an arithmetic number, because the mean of its divisors is an integer number (76434840).

Almost surely, 2^2145607728 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 2145607728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3057393600).

2145607728 is an abundant number, since it is smaller than the sum of its proper divisors (3969179472).

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

2145607728 is a wasteful number, since it uses less digits than its factorization.

2145607728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45770 (or 45764 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 42.

The square root of 2145607728 is about 46320.7051759793. The cubic root of 2145607728 is about 1289.7833756798.

The spelling of 2145607728 in words is "two billion, one hundred forty-five million, six hundred seven thousand, seven hundred twenty-eight".