91401077880 has 288 divisors, whose sum is σ = 350290558800. Its totient is φ = 20605197312.

The previous prime is 91401077863. The next prime is 91401077899. The reversal of 91401077880 is 8877010419.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1252231 + ... + 1323209.

Almost surely, 2^91401077880 is an apocalyptic number.

91401077880 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91401077880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (175145279400).

91401077880 is an abundant number, since it is smaller than the sum of its proper divisors (258889480920).

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

91401077880 is a wasteful number, since it uses less digits than its factorization.

91401077880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71083 (or 71069 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 45.

The spelling of 91401077880 in words is "ninety-one billion, four hundred one million, seventy-seven thousand, eight hundred eighty".