91534978448 has 20 divisors (see below), whose sum is σ = 177452124108. Its totient is φ = 45740881920.

The previous prime is 91534978421. The next prime is 91534978459. The reversal of 91534978448 is 84487943519.

It can be written as a sum of positive squares in 2 ways, for example, as 70951911424 + 20583067024 = 266368^2 + 143468^2 .

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, 1634561 + ... + 1689632.

Almost surely, 2^91534978448 is an apocalyptic number.

It is an amenable number.

91534978448 is a deficient number, since it is larger than the sum of its proper divisors (85917145660).

91534978448 is a wasteful number, since it uses less digits than its factorization.

91534978448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3325922 (or 3325916 counting only the distinct ones).

The product of its digits is 34836480, while the sum is 62.

The spelling of 91534978448 in words is "ninety-one billion, five hundred thirty-four million, nine hundred seventy-eight thousand, four hundred forty-eight".