91440205476 has 12 divisors (see below), whose sum is σ = 213360479472. Its totient is φ = 30480068488.

The previous prime is 91440205447. The next prime is 91440205511. The reversal of 91440205476 is 67450204419.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×91440205476² (a number of 23 digits) contains 22 as substring.

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, 3810008550 + ... + 3810008573.

It is an arithmetic number, because the mean of its divisors is an integer number (17780039956).

Almost surely, 2^91440205476 is an apocalyptic number.

It is an amenable number.

91440205476 is an abundant number, since it is smaller than the sum of its proper divisors (121920273996).

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

91440205476 is a wasteful number, since it uses less digits than its factorization.

91440205476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7620017130 (or 7620017128 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 42.

The spelling of 91440205476 in words is "ninety-one billion, four hundred forty million, two hundred five thousand, four hundred seventy-six".