28278774216 has 256 divisors, whose sum is σ = 100215244800. Its totient is φ = 7174137600.

The previous prime is 28278774187. The next prime is 28278774239. The reversal of 28278774216 is 61247787282.

28278774216 is a `hidden beast` number, since 2 + 82 + 78 + 77 + 421 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

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, 695406 + ... + 734946.

It is an arithmetic number, because the mean of its divisors is an integer number (391465800).

Almost surely, 2^28278774216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28278774216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50107622400).

28278774216 is an abundant number, since it is smaller than the sum of its proper divisors (71936470584).

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

28278774216 is a wasteful number, since it uses less digits than its factorization.

28278774216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39617 (or 39607 counting only the distinct ones).

The product of its digits is 4214784, while the sum is 54.

The spelling of 28278774216 in words is "twenty-eight billion, two hundred seventy-eight million, seven hundred seventy-four thousand, two hundred sixteen".