91644895000 has 40 divisors (see below), whose sum is σ = 214724000700. Its totient is φ = 36657956000.

The previous prime is 91644894989. The next prime is 91644895003. The reversal of 91644895000 is 59844619.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×91644895000² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91644895003) by changing a digit.

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 9 ways as a sum of consecutive naturals, for example, 9159490 + ... + 9169489.

Almost surely, 2^91644895000 is an apocalyptic number.

It is an amenable number.

91644895000 is an abundant number, since it is smaller than the sum of its proper divisors (123079105700).

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

91644895000 is a wasteful number, since it uses less digits than its factorization.

91644895000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18329005 (or 18328986 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 46.

The spelling of 91644895000 in words is "ninety-one billion, six hundred forty-four million, eight hundred ninety-five thousand".