91541283840 has 704 divisors, whose sum is σ = 344666327040. Its totient is φ = 23003136000.

The previous prime is 91541283829. The next prime is 91541283857. The reversal of 91541283840 is 4838214519.

91541283840 is a `hidden beast` number, since 9 + 1 + 541 + 28 + 3 + 84 + 0 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 175702780 + ... + 175703300.

Almost surely, 2^91541283840 is an apocalyptic number.

91541283840 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 91541283840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (172333163520).

91541283840 is an abundant number, since it is smaller than the sum of its proper divisors (253125043200).

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

91541283840 is a wasteful number, since it uses less digits than its factorization.

91541283840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627 (or 603 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The spelling of 91541283840 in words is "ninety-one billion, five hundred forty-one million, two hundred eighty-three thousand, eight hundred forty".