91284999640 has 16 divisors (see below), whose sum is σ = 205391249280. Its totient is φ = 36513999840.

The previous prime is 91284999613. The next prime is 91284999643. The reversal of 91284999640 is 4699948219.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91284999643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1141062456 + ... + 1141062535.

It is an arithmetic number, because the mean of its divisors is an integer number (12836953080).

Almost surely, 2^91284999640 is an apocalyptic number.

It is an amenable number.

91284999640 is an abundant number, since it is smaller than the sum of its proper divisors (114106249640).

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

91284999640 is a wasteful number, since it uses less digits than its factorization.

91284999640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2282125002 (or 2282124998 counting only the distinct ones).

The product of its (nonzero) digits is 10077696, while the sum is 61.

The spelling of 91284999640 in words is "ninety-one billion, two hundred eighty-four million, nine hundred ninety-nine thousand, six hundred forty".