28647017280 has 784 divisors, whose sum is σ = 119452973184. Its totient is φ = 6404935680.

The previous prime is 28647017279. The next prime is 28647017317. The reversal of 28647017280 is 8271074682.

28647017280 is a `hidden beast` number, since 2 + 8 + 6 + 470 + 172 + 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 pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 86546715 + ... + 86547045.

Almost surely, 2^28647017280 is an apocalyptic number.

28647017280 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 28647017280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59726486592).

28647017280 is an abundant number, since it is smaller than the sum of its proper divisors (90805955904).

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

28647017280 is an equidigital number, since it uses as much as digits as its factorization.

28647017280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426 (or 401 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 45.

The spelling of 28647017280 in words is "twenty-eight billion, six hundred forty-seven million, seventeen thousand, two hundred eighty".