91387471104 has 216 divisors, whose sum is σ = 277742660832. Its totient is φ = 29961861120.

The previous prime is 91387471099. The next prime is 91387471111. The reversal of 91387471104 is 40117478319.

91387471104 is a `hidden beast` number, since 91 + 3 + 87 + 471 + 10 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (216).

It is a self number, because there is not a number n which added to its sum of digits gives 91387471104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3782647 + ... + 3806729.

It is an arithmetic number, because the mean of its divisors is an integer number (1285845652).

Almost surely, 2^91387471104 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91387471104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138871330416).

91387471104 is an abundant number, since it is smaller than the sum of its proper divisors (186355189728).

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

91387471104 is an equidigital number, since it uses as much as digits as its factorization.

91387471104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24175 (or 24149 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The spelling of 91387471104 in words is "ninety-one billion, three hundred eighty-seven million, four hundred seventy-one thousand, one hundred four".