91863728192 has 28 divisors (see below), whose sum is σ = 182338155516. Its totient is φ = 45920256000.

The previous prime is 91863728191. The next prime is 91863728221. The reversal of 91863728192 is 29182736819.

It can be written as a sum of positive squares in 2 ways, for example, as 2644427776 + 89219300416 = 51424^2 + 298696^2 .

It is not an unprimeable number, because it can be changed into a prime (91863728191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76688 + ... + 435440.

Almost surely, 2^91863728192 is an apocalyptic number.

It is an amenable number.

91863728192 is a deficient number, since it is larger than the sum of its proper divisors (90474427324).

91863728192 is a wasteful number, since it uses less digits than its factorization.

91863728192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362766 (or 362756 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 56.

The spelling of 91863728192 in words is "ninety-one billion, eight hundred sixty-three million, seven hundred twenty-eight thousand, one hundred ninety-two".