91287336420 has 96 divisors (see below), whose sum is σ = 324577209600. Its totient is φ = 20865676032.

The previous prime is 91287336311. The next prime is 91287336431. The reversal of 91287336420 is 2463378219.

91287336420 is a `hidden beast` number, since 9 + 1 + 287 + 3 + 364 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12071265 + ... + 12078824.

It is an arithmetic number, because the mean of its divisors is an integer number (3381012600).

Almost surely, 2^91287336420 is an apocalyptic number.

91287336420 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

91287336420 is an abundant number, since it is smaller than the sum of its proper divisors (233289873180).

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

91287336420 is a wasteful number, since it uses less digits than its factorization.

91287336420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24150114 (or 24150106 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The spelling of 91287336420 in words is "ninety-one billion, two hundred eighty-seven million, three hundred thirty-six thousand, four hundred twenty".