91989080036 has 36 divisors (see below), whose sum is σ = 187442419500. Its totient is φ = 39386221056.

The previous prime is 91989080021. The next prime is 91989080039. The reversal of 91989080036 is 63008098919.

It can be written as a sum of positive squares in 2 ways, for example, as 85778694400 + 6210385636 = 292880^2 + 78806^2 .

It is a super-2 number, since 2×91989080036² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 91989080036.

It is not an unprimeable number, because it can be changed into a prime (91989080039) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18101 + ... + 429308.

It is an arithmetic number, because the mean of its divisors is an integer number (5206733875).

Almost surely, 2^91989080036 is an apocalyptic number.

It is an amenable number.

91989080036 is an abundant number, since it is smaller than the sum of its proper divisors (95453339464).

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

91989080036 is a wasteful number, since it uses less digits than its factorization.

91989080036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448476 (or 448467 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 53.

The spelling of 91989080036 in words is "ninety-one billion, nine hundred eighty-nine million, eighty thousand, thirty-six".