91423686582 has 64 divisors (see below), whose sum is σ = 214203552000. Its totient is φ = 28823796864.

The previous prime is 91423686581. The next prime is 91423686583. The reversal of 91423686582 is 28568632419.

91423686582 is a `hidden beast` number, since 9 + 142 + 368 + 65 + 82 = 666.

It is an interprime number because it is at equal distance from previous prime (91423686581) and next prime (91423686583).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91423686581) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 563118 + ... + 707070.

It is an arithmetic number, because the mean of its divisors is an integer number (3346930500).

Almost surely, 2^91423686582 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91423686582, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107101776000).

91423686582 is an abundant number, since it is smaller than the sum of its proper divisors (122779865418).

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

91423686582 is a wasteful number, since it uses less digits than its factorization.

91423686582 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144602 (or 144596 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 54.

The spelling of 91423686582 in words is "ninety-one billion, four hundred twenty-three million, six hundred eighty-six thousand, five hundred eighty-two".