91244420 has 24 divisors (see below), whose sum is σ = 193127424. Its totient is φ = 36209376.

The previous prime is 91244407. The next prime is 91244459. The reversal of 91244420 is 2444219.

It is a super-2 number, since 2×91244420² = 16651088362272800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 91244420.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15422 + ... + 20501.

It is an arithmetic number, because the mean of its divisors is an integer number (8046976).

Almost surely, 2^91244420 is an apocalyptic number.

It is an amenable number.

91244420 is an abundant number, since it is smaller than the sum of its proper divisors (101883004).

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

91244420 is a wasteful number, since it uses less digits than its factorization.

91244420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36059 (or 36057 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 91244420 is about 9552.1945122574. The cubic root of 91244420 is about 450.1964903227.

Adding to 91244420 its reverse (2444219), we get a palindrome (93688639).

The spelling of 91244420 in words is "ninety-one million, two hundred forty-four thousand, four hundred twenty".