28836891000 has 320 divisors, whose sum is σ = 101364120000. Its totient is φ = 7646918400.

The previous prime is 28836890993. The next prime is 28836891001. The reversal of 28836891000 is 19863882.

28836891000 is a `hidden beast` number, since 288 + 368 + 9 + 1 + 0 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28836891001) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 16118106 + ... + 16119894.

It is an arithmetic number, because the mean of its divisors is an integer number (316762875).

Almost surely, 2^28836891000 is an apocalyptic number.

28836891000 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 28836891000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50682060000).

28836891000 is an abundant number, since it is smaller than the sum of its proper divisors (72527229000).

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

28836891000 is a wasteful number, since it uses less digits than its factorization.

28836891000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2021 (or 1998 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The spelling of 28836891000 in words is "twenty-eight billion, eight hundred thirty-six million, eight hundred ninety-one thousand".