28478682216 has 32 divisors (see below), whose sum is σ = 79107451200. Its totient is φ = 9492894000.

The previous prime is 28478682191. The next prime is 28478682229. The reversal of 28478682216 is 61228687482.

28478682216 is a `hidden beast` number, since 284 + 78 + 6 + 82 + 216 = 666.

It is a super-2 number, since 2×28478682216² (a number of 22 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65922660 + ... + 65923091.

It is an arithmetic number, because the mean of its divisors is an integer number (2472107850).

Almost surely, 2^28478682216 is an apocalyptic number.

It is an amenable number.

28478682216 is an abundant number, since it is smaller than the sum of its proper divisors (50628768984).

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

28478682216 is a wasteful number, since it uses less digits than its factorization.

28478682216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131845766 (or 131845756 counting only the distinct ones).

The product of its digits is 4128768, while the sum is 54.

The spelling of 28478682216 in words is "twenty-eight billion, four hundred seventy-eight million, six hundred eighty-two thousand, two hundred sixteen".