2145155728 has 20 divisors (see below), whose sum is σ = 4158511740. Its totient is φ = 1071991424.

The previous prime is 2145155713. The next prime is 2145155767. The reversal of 2145155728 is 8275515412.

It can be written as a sum of positive squares in 2 ways, for example, as 544195584 + 1600960144 = 23328^2 + 40012^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5683 + ... + 65746.

It is an arithmetic number, because the mean of its divisors is an integer number (207925587).

Almost surely, 2^2145155728 is an apocalyptic number.

It is an amenable number.

2145155728 is a deficient number, since it is larger than the sum of its proper divisors (2013356012).

2145155728 is a wasteful number, since it uses less digits than its factorization.

2145155728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73314 (or 73308 counting only the distinct ones).

The product of its digits is 112000, while the sum is 40.

The square root of 2145155728 is about 46315.8258913732. The cubic root of 2145155728 is about 1289.6927994729.

The spelling of 2145155728 in words is "two billion, one hundred forty-five million, one hundred fifty-five thousand, seven hundred twenty-eight".