91005091440 has 80 divisors (see below), whose sum is σ = 282460019616. Its totient is φ = 24238412800.

The previous prime is 91005091417. The next prime is 91005091451. The reversal of 91005091440 is 4419050019.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×91005091440² (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 15 ways as a sum of consecutive naturals, for example, 33891 + ... + 427970.

Almost surely, 2^91005091440 is an apocalyptic number.

It is an amenable number.

91005091440 is an abundant number, since it is smaller than the sum of its proper divisors (191454928176).

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

91005091440 is a wasteful number, since it uses less digits than its factorization.

91005091440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462698 (or 462692 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 33.

The spelling of 91005091440 in words is "ninety-one billion, five million, ninety-one thousand, four hundred forty".