91720322 has 8 divisors (see below), whose sum is σ = 138942972. Its totient is φ = 45406000.

The previous prime is 91720309. The next prime is 91720361. The reversal of 91720322 is 22302719.

It can be written as a sum of positive squares in 2 ways, for example, as 91604041 + 116281 = 9571^2 + 341^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 91720291 and 91720300.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 226829 + ... + 227232.

Almost surely, 2^91720322 is an apocalyptic number.

91720322 is a deficient number, since it is larger than the sum of its proper divisors (47222650).

91720322 is a wasteful number, since it uses less digits than its factorization.

91720322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454164.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 91720322 is about 9577.0727260473. The cubic root of 91720322 is about 450.9778275998.

The spelling of 91720322 in words is "ninety-one million, seven hundred twenty thousand, three hundred twenty-two".