28115731185500 has 288 divisors, whose sum is σ = 74015349338112. Its totient is φ = 9130160592000.

The previous prime is 28115731185481. The next prime is 28115731185517. The reversal of 28115731185500 is 558113751182.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 239617847 + ... + 239735153.

Almost surely, 2^{28115731185500} is an apocalyptic number.

28115731185500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28115731185500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37007674669056).

28115731185500 is an abundant number, since it is smaller than the sum of its proper divisors (45899618152612).

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

28115731185500 is a wasteful number, since it uses less digits than its factorization.

28115731185500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117458 (or 117399 counting only the distinct ones).

The product of its (nonzero) digits is 336000, while the sum is 47.

The spelling of 28115731185500 in words is "twenty-eight trillion, one hundred fifteen billion, seven hundred thirty-one million, one hundred eighty-five thousand, five hundred".