91088240 has 40 divisors (see below), whose sum is σ = 212397120. Its totient is φ = 36329216.

The previous prime is 91088237. The next prime is 91088251. The reversal of 91088240 is 4288019.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 91088197 and 91088206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29657 + ... + 32583.

It is an arithmetic number, because the mean of its divisors is an integer number (5309928).

Almost surely, 2^91088240 is an apocalyptic number.

It is an amenable number.

91088240 is an abundant number, since it is smaller than the sum of its proper divisors (121308880).

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

91088240 is a wasteful number, since it uses less digits than its factorization.

91088240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3329 (or 3323 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 91088240 is about 9544.0159262231. The cubic root of 91088240 is about 449.9394815735.

The spelling of 91088240 in words is "ninety-one million, eighty-eight thousand, two hundred forty".