91022864040 has 96 divisors (see below), whose sum is σ = 313225759080. Its totient is φ = 22844952576.

The previous prime is 91022864033. The next prime is 91022864047. The reversal of 91022864040 is 4046822019.

91022864040 is a `hidden beast` number, since 9 + 1 + 0 + 2 + 2 + 8 + 640 + 4 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (91022864033) and next prime (91022864047).

It can be written as a sum of positive squares in 4 ways, for example, as 69313199076 + 21709664964 = 263274^2 + 147342^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 91022863986 and 91022864004.

It is not an unprimeable number, because it can be changed into a prime (91022864047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7430389 + ... + 7442628.

Almost surely, 2^91022864040 is an apocalyptic number.

91022864040 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

91022864040 is an abundant number, since it is smaller than the sum of its proper divisors (222202895040).

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

91022864040 is a wasteful number, since it uses less digits than its factorization.

91022864040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14873051 (or 14873044 counting only the distinct ones).

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

The spelling of 91022864040 in words is "ninety-one billion, twenty-two million, eight hundred sixty-four thousand, forty".