91894281728 has 40 divisors (see below), whose sum is σ = 194409635112. Its totient is φ = 43244363776.

The previous prime is 91894281697. The next prime is 91894281733. The reversal of 91894281728 is 82718249819.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5270150 + ... + 5287557.

Almost surely, 2^91894281728 is an apocalyptic number.

It is an amenable number.

91894281728 is an abundant number, since it is smaller than the sum of its proper divisors (102515353384).

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

91894281728 is a wasteful number, since it uses less digits than its factorization.

91894281728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10557742 (or 10557726 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 59.

The spelling of 91894281728 in words is "ninety-one billion, eight hundred ninety-four million, two hundred eighty-one thousand, seven hundred twenty-eight".