91881560 has 16 divisors (see below), whose sum is σ = 206733600. Its totient is φ = 36752608.

The previous prime is 91881557. The next prime is 91881607. The reversal of 91881560 is 6518819.

It is a congruent number.

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, 1148480 + ... + 1148559.

It is an arithmetic number, because the mean of its divisors is an integer number (12920850).

Almost surely, 2^91881560 is an apocalyptic number.

It is an amenable number.

91881560 is an abundant number, since it is smaller than the sum of its proper divisors (114852040).

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

91881560 is a wasteful number, since it uses less digits than its factorization.

91881560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2297050 (or 2297046 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 91881560 is about 9585.4869464206. The cubic root of 91881560 is about 451.2419355378.

The spelling of 91881560 in words is "ninety-one million, eight hundred eighty-one thousand, five hundred sixty".