91488636 has 48 divisors (see below), whose sum is σ = 240217600. Its totient is φ = 30107376.

The previous prime is 91488623. The next prime is 91488647. The reversal of 91488636 is 63688419.

91488636 is a `hidden beast` number, since 9 + 1 + 4 + 8 + 8 + 636 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 91488591 and 91488600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3171 + ... + 13893.

Almost surely, 2^91488636 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91488636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120108800).

91488636 is an abundant number, since it is smaller than the sum of its proper divisors (148728964).

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

91488636 is a wasteful number, since it uses less digits than its factorization.

91488636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10815 (or 10807 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 91488636 is about 9564.9692106143. The cubic root of 91488636 is about 450.5977833264.

The spelling of 91488636 in words is "ninety-one million, four hundred eighty-eight thousand, six hundred thirty-six".