28727774880 has 288 divisors, whose sum is σ = 106606160640. Its totient is φ = 6482810880.

The previous prime is 28727774879. The next prime is 28727774903. The reversal of 28727774880 is 8847772782.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1850350 + ... + 1865810.

It is an arithmetic number, because the mean of its divisors is an integer number (370160280).

Almost surely, 2^28727774880 is an apocalyptic number.

28727774880 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 28727774880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53303080320).

28727774880 is an abundant number, since it is smaller than the sum of its proper divisors (77878385760).

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

28727774880 is a wasteful number, since it uses less digits than its factorization.

28727774880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15572 (or 15557 counting only the distinct ones).

The product of its (nonzero) digits is 19668992, while the sum is 60.

The spelling of 28727774880 in words is "twenty-eight billion, seven hundred twenty-seven million, seven hundred seventy-four thousand, eight hundred eighty".