28177325280 has 384 divisors, whose sum is σ = 111800908800. Its totient is φ = 6570657792.

The previous prime is 28177325243. The next prime is 28177325311. The reversal of 28177325280 is 8252377182.

28177325280 is a `hidden beast` number, since 28 + 1 + 77 + 32 + 528 + 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 63 ways as a sum of consecutive naturals, for example, 1053837 + ... + 1080243.

It is an arithmetic number, because the mean of its divisors is an integer number (291148200).

Almost surely, 2^28177325280 is an apocalyptic number.

28177325280 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 28177325280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55900454400).

28177325280 is an abundant number, since it is smaller than the sum of its proper divisors (83623583520).

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

28177325280 is a wasteful number, since it uses less digits than its factorization.

28177325280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26463 (or 26449 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 45.

The spelling of 28177325280 in words is "twenty-eight billion, one hundred seventy-seven million, three hundred twenty-five thousand, two hundred eighty".