91223766 has 32 divisors (see below), whose sum is σ = 203793120. Its totient is φ = 30246912.

The previous prime is 91223707. The next prime is 91223767. The reversal of 91223766 is 66732219.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 91223766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91223767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6046 + ... + 14798.

It is an arithmetic number, because the mean of its divisors is an integer number (6368535).

Almost surely, 2^91223766 is an apocalyptic number.

91223766 is an abundant number, since it is smaller than the sum of its proper divisors (112569354).

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

91223766 is a wasteful number, since it uses less digits than its factorization.

91223766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8957 (or 8951 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 91223766 is about 9551.1133382449. The cubic root of 91223766 is about 450.1625190764.

The spelling of 91223766 in words is "ninety-one million, two hundred twenty-three thousand, seven hundred sixty-six".