91371577880 has 32 divisors (see below), whose sum is σ = 224275692240. Its totient is φ = 33226028160.

The previous prime is 91371577763. The next prime is 91371577889. The reversal of 91371577880 is 8877517319.

It is a happy number.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91371577889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103830899 + ... + 103831778.

Almost surely, 2^91371577880 is an apocalyptic number.

It is an amenable number.

91371577880 is an abundant number, since it is smaller than the sum of its proper divisors (132904114360).

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

91371577880 is a wasteful number, since it uses less digits than its factorization.

91371577880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207662699 (or 207662695 counting only the distinct ones).

The product of its (nonzero) digits is 2963520, while the sum is 56.

The spelling of 91371577880 in words is "ninety-one billion, three hundred seventy-one million, five hundred seventy-seven thousand, eight hundred eighty".