91022864004 has 72 divisors (see below), whose sum is σ = 235417946400. Its totient is φ = 29645557632.

The previous prime is 91022863957. The next prime is 91022864011. The reversal of 91022864004 is 40046822019.

91022864004 is a `hidden beast` number, since 9 + 1 + 0 + 2 + 2 + 8 + 640 + 0 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 91022864004.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 119347 + ... + 443045.

It is an arithmetic number, because the mean of its divisors is an integer number (3269693700).

Almost surely, 2^91022864004 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 91022864004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117708973200).

91022864004 is an abundant number, since it is smaller than the sum of its proper divisors (144395082396).

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

91022864004 is a wasteful number, since it uses less digits than its factorization.

91022864004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323889 (or 323884 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The spelling of 91022864004 in words is "ninety-one billion, twenty-two million, eight hundred sixty-four thousand, four".