91272312 has 32 divisors (see below), whose sum is σ = 253534800. Its totient is φ = 30424032.

The previous prime is 91272299. The next prime is 91272319. The reversal of 91272312 is 21327219.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91272319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 211063 + ... + 211494.

Almost surely, 2^91272312 is an apocalyptic number.

It is an amenable number.

91272312 is an abundant number, since it is smaller than the sum of its proper divisors (162262488).

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

91272312 is a wasteful number, since it uses less digits than its factorization.

91272312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422572 (or 422562 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 91272312 is about 9553.6543793462. The cubic root of 91272312 is about 450.2423583375.

The spelling of 91272312 in words is "ninety-one million, two hundred seventy-two thousand, three hundred twelve".