28911125880 has 320 divisors, whose sum is σ = 119599381440. Its totient is φ = 6099867648.

The previous prime is 28911125869. The next prime is 28911125909. The reversal of 28911125880 is 8852111982.

28911125880 is a `hidden beast` number, since 289 + 111 + 258 + 8 + 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 an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 245812 + ... + 343868.

It is an arithmetic number, because the mean of its divisors is an integer number (373748067).

Almost surely, 2^28911125880 is an apocalyptic number.

28911125880 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 28911125880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59799690720).

28911125880 is an abundant number, since it is smaller than the sum of its proper divisors (90688255560).

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

28911125880 is a wasteful number, since it uses less digits than its factorization.

28911125880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98100 (or 98087 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 45.

The spelling of 28911125880 in words is "twenty-eight billion, nine hundred eleven million, one hundred twenty-five thousand, eight hundred eighty".