5128921872 has 30 divisors (see below), whose sum is σ = 14353858142. Its totient is φ = 1709640576.

The previous prime is 5128921867. The next prime is 5128921873. The reversal of 5128921872 is 2781298215.

It can be written as a sum of positive squares in only one way, i.e., 4897760256 + 231161616 = 69984^2 + 15204^2 .

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (5128921873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17808613 + ... + 17808900.

Almost surely, 2^5128921872 is an apocalyptic number.

It is an amenable number.

5128921872 is an abundant number, since it is smaller than the sum of its proper divisors (9224936270).

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

5128921872 is a wasteful number, since it uses less digits than its factorization.

5128921872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35617527 (or 35617518 counting only the distinct ones).

The product of its digits is 161280, while the sum is 45.

The square root of 5128921872 is about 71616.4916202965. The cubic root of 5128921872 is about 1724.5482955907.

The spelling of 5128921872 in words is "five billion, one hundred twenty-eight million, nine hundred twenty-one thousand, eight hundred seventy-two".