28157998722 has 64 divisors (see below), whose sum is σ = 71110047744. Its totient is φ = 7242681600.

The previous prime is 28157998691. The next prime is 28157998723. The reversal of 28157998722 is 22789975182.

It is not an unprimeable number, because it can be changed into a prime (28157998723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 840904 + ... + 873747.

It is an arithmetic number, because the mean of its divisors is an integer number (1111094496).

Almost surely, 2^28157998722 is an apocalyptic number.

28157998722 is an abundant number, since it is smaller than the sum of its proper divisors (42952049022).

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

28157998722 is a wasteful number, since it uses less digits than its factorization.

28157998722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1714703.

The product of its digits is 10160640, while the sum is 60.

The spelling of 28157998722 in words is "twenty-eight billion, one hundred fifty-seven million, nine hundred ninety-eight thousand, seven hundred twenty-two".