91998722 has 16 divisors (see below), whose sum is σ = 145700640. Its totient is φ = 43446528.

The previous prime is 91998691. The next prime is 91998727. The reversal of 91998722 is 22789919.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (91998727) 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, 9698 + ... + 16674.

It is an arithmetic number, because the mean of its divisors is an integer number (9106290).

Almost surely, 2^91998722 is an apocalyptic number.

91998722 is a deficient number, since it is larger than the sum of its proper divisors (53701918).

91998722 is a wasteful number, since it uses less digits than its factorization.

91998722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7345.

The product of its digits is 163296, while the sum is 47.

The square root of 91998722 is about 9591.5964260388. The cubic root of 91998722 is about 451.4336531940.

It can be divided in two parts, 9199872 and 2, that multiplied together give a cube (18399744 = 264³).

The spelling of 91998722 in words is "ninety-one million, nine hundred ninety-eight thousand, seven hundred twenty-two".