91223768 has 16 divisors (see below), whose sum is σ = 181106280. Its totient is φ = 42928768.

The previous prime is 91223767. The next prime is 91223771. The reversal of 91223768 is 86732219.

91223768 = T₂ + T₃ + ... + T₈₁₇.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 335246 + ... + 335517.

Almost surely, 2^91223768 is an apocalyptic number.

It is an amenable number.

91223768 is a deficient number, since it is larger than the sum of its proper divisors (89882512).

91223768 is a wasteful number, since it uses less digits than its factorization.

91223768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670786 (or 670782 counting only the distinct ones).

The product of its digits is 36288, while the sum is 38.

The square root of 91223768 is about 9551.1134429448. The cubic root of 91223768 is about 450.1625223662.

The spelling of 91223768 in words is "ninety-one million, two hundred twenty-three thousand, seven hundred sixty-eight".