91687088 has 60 divisors (see below), whose sum is σ = 188391960. Its totient is φ = 43211520.

The previous prime is 91687081. The next prime is 91687091. The reversal of 91687088 is 88078619.

It is not an unprimeable number, because it can be changed into a prime (91687081) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1030148 + ... + 1030236.

It is an arithmetic number, because the mean of its divisors is an integer number (3139866).

Almost surely, 2^91687088 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 91687088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94195980).

91687088 is an abundant number, since it is smaller than the sum of its proper divisors (96704872).

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

91687088 is a wasteful number, since it uses less digits than its factorization.

91687088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226 (or 189 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 47.

The square root of 91687088 is about 9575.3374875249. The cubic root of 91687088 is about 450.9233518217.

The spelling of 91687088 in words is "ninety-one million, six hundred eighty-seven thousand, eighty-eight".