91452220 has 12 divisors (see below), whose sum is σ = 192049704. Its totient is φ = 36580880.

The previous prime is 91452211. The next prime is 91452227. The reversal of 91452220 is 2225419.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91452227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2286286 + ... + 2286325.

It is an arithmetic number, because the mean of its divisors is an integer number (16004142).

Almost surely, 2^91452220 is an apocalyptic number.

It is an amenable number.

91452220 is an abundant number, since it is smaller than the sum of its proper divisors (100597484).

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

91452220 is a wasteful number, since it uses less digits than its factorization.

91452220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4572620 (or 4572618 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 91452220 is about 9563.0654081210. The cubic root of 91452220 is about 450.5379903028.

Adding to 91452220 its reverse (2225419), we get a palindrome (93677639).

The spelling of 91452220 in words is "ninety-one million, four hundred fifty-two thousand, two hundred twenty".