91220706 has 12 divisors (see below), whose sum is σ = 197644902. Its totient is φ = 30406896.

The previous prime is 91220699. The next prime is 91220707. The reversal of 91220706 is 60702219.

It can be written as a sum of positive squares in only one way, i.e., 56115081 + 35105625 = 7491^2 + 5925^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 91220706.

It is not an unprimeable number, because it can be changed into a prime (91220707) 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 5 ways as a sum of consecutive naturals, for example, 2533891 + ... + 2533926.

Almost surely, 2^91220706 is an apocalyptic number.

91220706 is an abundant number, since it is smaller than the sum of its proper divisors (106424196).

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

91220706 is a wasteful number, since it uses less digits than its factorization.

91220706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5067825 (or 5067822 counting only the distinct ones).

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

The square root of 91220706 is about 9550.9531461525. The cubic root of 91220706 is about 450.1574856194.

The spelling of 91220706 in words is "ninety-one million, two hundred twenty thousand, seven hundred six".