91997448 has 32 divisors (see below), whose sum is σ = 230666400. Its totient is φ = 30576128.

The previous prime is 91997443. The next prime is 91997467. The reversal of 91997448 is 84479919.

It is a self number, because there is not a number n which added to its sum of digits gives 91997448.

It is not an unprimeable number, because it can be changed into a prime (91997443) 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, 3043 + ... + 13901.

It is an arithmetic number, because the mean of its divisors is an integer number (7208325).

Almost surely, 2^91997448 is an apocalyptic number.

It is an amenable number.

91997448 is an abundant number, since it is smaller than the sum of its proper divisors (138668952).

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

91997448 is a wasteful number, since it uses less digits than its factorization.

91997448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11221 (or 11217 counting only the distinct ones).

The product of its digits is 653184, while the sum is 51.

The square root of 91997448 is about 9591.5300135067. The cubic root of 91997448 is about 451.4315693638.

The spelling of 91997448 in words is "ninety-one million, nine hundred ninety-seven thousand, four hundred forty-eight".