28809371136 has 320 divisors, whose sum is σ = 95693875200. Its totient is φ = 7499022336.

The previous prime is 28809371117. The next prime is 28809371141. The reversal of 28809371136 is 63117390882.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11041000 + ... + 11043608.

It is an arithmetic number, because the mean of its divisors is an integer number (299043360).

Almost surely, 2^28809371136 is an apocalyptic number.

28809371136 is a gapful number since it is divisible by the number (26) 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 28809371136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47846937600).

28809371136 is an abundant number, since it is smaller than the sum of its proper divisors (66884504064).

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

28809371136 is a wasteful number, since it uses less digits than its factorization.

28809371136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2729 (or 2713 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 48.

The spelling of 28809371136 in words is "twenty-eight billion, eight hundred nine million, three hundred seventy-one thousand, one hundred thirty-six".