91808440 has 32 divisors (see below), whose sum is σ = 211376880. Its totient is φ = 35868672.

The previous prime is 91808413. The next prime is 91808441. The reversal of 91808440 is 4480819.

It is a junction number, because it is equal to n+sod(n) for n = 91808396 and 91808405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91808441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24969 + ... + 28408.

Almost surely, 2^91808440 is an apocalyptic number.

It is an amenable number.

91808440 is an abundant number, since it is smaller than the sum of its proper divisors (119568440).

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

91808440 is a wasteful number, since it uses less digits than its factorization.

91808440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53431 (or 53427 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 91808440 is about 9581.6720878978. The cubic root of 91808440 is about 451.1222032553.

The spelling of 91808440 in words is "ninety-one million, eight hundred eight thousand, four hundred forty".