91288866 has 16 divisors (see below), whose sum is σ = 182671488. Its totient is φ = 30414000.

The previous prime is 91288859. The next prime is 91288867. The reversal of 91288866 is 66888219.

It is not an unprimeable number, because it can be changed into a prime (91288867) 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, 20151 + ... + 24261.

It is an arithmetic number, because the mean of its divisors is an integer number (11416968).

Almost surely, 2^91288866 is an apocalyptic number.

91288866 is an abundant number, since it is smaller than the sum of its proper divisors (91382622).

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

91288866 is a wasteful number, since it uses less digits than its factorization.

91288866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7817.

The product of its digits is 331776, while the sum is 48.

The square root of 91288866 is about 9554.5207101141. The cubic root of 91288866 is about 450.2695767469.

The spelling of 91288866 in words is "ninety-one million, two hundred eighty-eight thousand, eight hundred sixty-six".