91744427 has 8 divisors (see below), whose sum is σ = 98734752. Its totient is φ = 84931200.

The previous prime is 91744399. The next prime is 91744439. The reversal of 91744427 is 72444719.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91744427 - 2¹² = 91740331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91744727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43199 + ... + 45272.

It is an arithmetic number, because the mean of its divisors is an integer number (12341844).

Almost surely, 2^91744427 is an apocalyptic number.

91744427 is a deficient number, since it is larger than the sum of its proper divisors (6990325).

91744427 is a wasteful number, since it uses less digits than its factorization.

91744427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88549.

The product of its digits is 56448, while the sum is 38.

The square root of 91744427 is about 9578.3311176843. The cubic root of 91744427 is about 451.0173312711.

The spelling of 91744427 in words is "ninety-one million, seven hundred forty-four thousand, four hundred twenty-seven".