28506128180 has 12 divisors (see below), whose sum is σ = 59862869220. Its totient is φ = 11402451264.

The previous prime is 28506128143. The next prime is 28506128219. The reversal of 28506128180 is 8182160582.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15846277924 + 12659850256 = 125882^2 + 112516^2 .

It is a super-2 number, since 2×28506128180² (a number of 22 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 712653185 + ... + 712653224.

It is an arithmetic number, because the mean of its divisors is an integer number (4988572435).

Almost surely, 2^28506128180 is an apocalyptic number.

28506128180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28506128180 is an abundant number, since it is smaller than the sum of its proper divisors (31356741040).

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

28506128180 is a wasteful number, since it uses less digits than its factorization.

28506128180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1425306418 (or 1425306416 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 41.

The spelling of 28506128180 in words is "twenty-eight billion, five hundred six million, one hundred twenty-eight thousand, one hundred eighty".