91836191840 has 48 divisors (see below), whose sum is σ = 216990092592. Its totient is φ = 36729890304.

The previous prime is 91836191833. The next prime is 91836191891. The reversal of 91836191840 is 4819163819.

It is a super-2 number, since 2×91836191840² (a number of 23 digits) contains 22 as substring.

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, 1438682 + ... + 1501158.

It is an arithmetic number, because the mean of its divisors is an integer number (4520626929).

Almost surely, 2^91836191840 is an apocalyptic number.

It is an amenable number.

91836191840 is an abundant number, since it is smaller than the sum of its proper divisors (125153900752).

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

91836191840 is a wasteful number, since it uses less digits than its factorization.

91836191840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71679 (or 71671 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 50.

The spelling of 91836191840 in words is "ninety-one billion, eight hundred thirty-six million, one hundred ninety-one thousand, eight hundred forty".