91216040 has 16 divisors (see below), whose sum is σ = 205236180. Its totient is φ = 36486400.

The previous prime is 91215997. The next prime is 91216057. The reversal of 91216040 is 4061219.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 86081284 + 5134756 = 9278^2 + 2266^2 .

It is a junction number, because it is equal to n+sod(n) for n = 91215997 and 91216015.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1140161 + ... + 1140240.

Almost surely, 2^91216040 is an apocalyptic number.

It is an amenable number.

91216040 is an abundant number, since it is smaller than the sum of its proper divisors (114020140).

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

91216040 is a wasteful number, since it uses less digits than its factorization.

91216040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2280412 (or 2280408 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 91216040 is about 9550.7088742145. The cubic root of 91216040 is about 450.1498102032.

Adding to 91216040 its reverse (4061219), we get a palindrome (95277259).

The spelling of 91216040 in words is "ninety-one million, two hundred sixteen thousand, forty".