91726774272 has 320 divisors, whose sum is σ = 313256251440. Its totient is φ = 26202341376.

The previous prime is 91726774247. The next prime is 91726774327. The reversal of 91726774272 is 27247762719.

91726774272 is a `hidden beast` number, since 91 + 72 + 67 + 7 + 427 + 2 = 666.

It is a super-2 number, since 2×91726774272² (a number of 23 digits) contains 22 as substring.

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

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 18576988 + ... + 18581924.

Almost surely, 2^91726774272 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 91726774272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (156628125720).

91726774272 is an abundant number, since it is smaller than the sum of its proper divisors (221529477168).

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

91726774272 is an frugal number, since it uses more digits than its factorization.

91726774272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4986 (or 4949 counting only the distinct ones).

The product of its digits is 4148928, while the sum is 54.

The spelling of 91726774272 in words is "ninety-one billion, seven hundred twenty-six million, seven hundred seventy-four thousand, two hundred seventy-two".