28002752500 has 30 divisors (see below), whose sum is σ = 61236424634. Its totient is φ = 11201100000.

The previous prime is 28002752447. The next prime is 28002752509. The reversal of 28002752500 is 525720082.

It can be written as a sum of positive squares in 5 ways, for example, as 15019973136 + 12982779364 = 122556^2 + 113942^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28002752509) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 5598051 + ... + 5603050.

Almost surely, 2^28002752500 is an apocalyptic number.

28002752500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28002752500 is an abundant number, since it is smaller than the sum of its proper divisors (33233672134).

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

28002752500 is a wasteful number, since it uses less digits than its factorization.

28002752500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11201125 (or 11201108 counting only the distinct ones).

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

The spelling of 28002752500 in words is "twenty-eight billion, two million, seven hundred fifty-two thousand, five hundred".