28000002752500 has 60 divisors (see below), whose sum is σ = 61918388601300. Its totient is φ = 11074158304000.

The previous prime is 28000002752453. The next prime is 28000002752503. The reversal of 28000002752500 is 525720000082.

It can be written as a sum of positive squares in 10 ways, for example, as 27997263067536 + 2739684964 = 5291244^2 + 52342^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28000002752503) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 62698855 + ... + 63143854.

It is an arithmetic number, because the mean of its divisors is an integer number (1031973143355).

Almost surely, 2^{28000002752500} is an apocalyptic number.

28000002752500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28000002752500 is an abundant number, since it is smaller than the sum of its proper divisors (33918385848800).

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

28000002752500 is a wasteful number, since it uses less digits than its factorization.

28000002752500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125842822 (or 125842805 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 31.

Adding to 28000002752500 its reverse (525720000082), we get a palindrome (28525722752582).

The spelling of 28000002752500 in words is "twenty-eight trillion, two million, seven hundred fifty-two thousand, five hundred".