28091715784 has 64 divisors (see below), whose sum is σ = 59091768000. Its totient is φ = 12411294720.

The previous prime is 28091715779. The next prime is 28091715797. The reversal of 28091715784 is 48751719082.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 431692 + ... + 492484.

It is an arithmetic number, because the mean of its divisors is an integer number (923308875).

Almost surely, 2^28091715784 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 28091715784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29545884000).

28091715784 is an abundant number, since it is smaller than the sum of its proper divisors (31000052216).

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

28091715784 is a wasteful number, since it uses less digits than its factorization.

28091715784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60958 (or 60954 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 52.

The spelling of 28091715784 in words is "twenty-eight billion, ninety-one million, seven hundred fifteen thousand, seven hundred eighty-four".