91722208 has 48 divisors (see below), whose sum is σ = 192734640. Its totient is φ = 42817536.

The previous prime is 91722203. The next prime is 91722217. The reversal of 91722208 is 80222719.

It is a self number, because there is not a number n which added to its sum of digits gives 91722208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91722203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75010 + ... + 76222.

It is an arithmetic number, because the mean of its divisors is an integer number (4015305).

Almost surely, 2^91722208 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91722208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96367320).

91722208 is an abundant number, since it is smaller than the sum of its proper divisors (101012432).

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

91722208 is a wasteful number, since it uses less digits than its factorization.

91722208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1379 (or 1371 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 91722208 is about 9577.1711898660. The cubic root of 91722208 is about 450.9809186572.

The spelling of 91722208 in words is "ninety-one million, seven hundred twenty-two thousand, two hundred eight".