91406890288 has 20 divisors (see below), whose sum is σ = 202400971600. Its totient is φ = 39174381504.

The previous prime is 91406890277. The next prime is 91406890303. The reversal of 91406890288 is 88209860419.

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, 408066363 + ... + 408066586.

It is an arithmetic number, because the mean of its divisors is an integer number (10120048580).

Almost surely, 2^91406890288 is an apocalyptic number.

It is an amenable number.

91406890288 is an abundant number, since it is smaller than the sum of its proper divisors (110994081312).

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

91406890288 is a wasteful number, since it uses less digits than its factorization.

91406890288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816132964 (or 816132958 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 55.

The spelling of 91406890288 in words is "ninety-one billion, four hundred six million, eight hundred ninety thousand, two hundred eighty-eight".