91800914640 has 40 divisors (see below), whose sum is σ = 284582836128. Its totient is φ = 24480243840.

The previous prime is 91800914587. The next prime is 91800914669. The reversal of 91800914640 is 4641900819.

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

It is a junction number, because it is equal to n+sod(n) for n = 91800914592 and 91800914601.

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, 191251666 + ... + 191252145.

Almost surely, 2^91800914640 is an apocalyptic number.

It is an amenable number.

91800914640 is an abundant number, since it is smaller than the sum of its proper divisors (192781921488).

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

91800914640 is a wasteful number, since it uses less digits than its factorization.

91800914640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382503827 (or 382503821 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 42.

The spelling of 91800914640 in words is "ninety-one billion, eight hundred million, nine hundred fourteen thousand, six hundred forty".