91122678580 has 24 divisors (see below), whose sum is σ = 195807804192. Its totient is φ = 35601418272.

The previous prime is 91122678539. The next prime is 91122678611. The reversal of 91122678580 is 8587622119.

It is a happy number.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52977442 + ... + 52979161.

It is an arithmetic number, because the mean of its divisors is an integer number (8158658508).

Almost surely, 2^91122678580 is an apocalyptic number.

It is an amenable number.

91122678580 is an abundant number, since it is smaller than the sum of its proper divisors (104685125612).

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

91122678580 is a wasteful number, since it uses less digits than its factorization.

91122678580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105956655 (or 105956653 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 49.

The spelling of 91122678580 in words is "ninety-one billion, one hundred twenty-two million, six hundred seventy-eight thousand, five hundred eighty".