91587280405 has 8 divisors (see below), whose sum is σ = 109929792384. Its totient is φ = 73253120400.

The previous prime is 91587280397. The next prime is 91587280417. The reversal of 91587280405 is 50408278519.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91587280405 - 2³ = 91587280397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2063841 + ... + 2107750.

It is an arithmetic number, because the mean of its divisors is an integer number (13741224048).

Almost surely, 2^91587280405 is an apocalyptic number.

It is an amenable number.

91587280405 is a deficient number, since it is larger than the sum of its proper divisors (18342511979).

91587280405 is a wasteful number, since it uses less digits than its factorization.

91587280405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4175987.

The product of its (nonzero) digits is 806400, while the sum is 49.

The spelling of 91587280405 in words is "ninety-one billion, five hundred eighty-seven million, two hundred eighty thousand, four hundred five".