91089669690 has 64 divisors (see below), whose sum is σ = 244760123520. Its totient is φ = 24105144960.

The previous prime is 91089669667. The next prime is 91089669707. The reversal of 91089669690 is 9696698019.

It is a super-2 number, since 2×91089669690² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1252299 + ... + 1323038.

It is an arithmetic number, because the mean of its divisors is an integer number (3824376930).

Almost surely, 2^91089669690 is an apocalyptic number.

91089669690 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

91089669690 is an abundant number, since it is smaller than the sum of its proper divisors (153670453830).

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

91089669690 is a wasteful number, since it uses less digits than its factorization.

91089669690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2575484 (or 2575478 counting only the distinct ones).

The product of its (nonzero) digits is 11337408, while the sum is 63.

The spelling of 91089669690 in words is "ninety-one billion, eighty-nine million, six hundred sixty-nine thousand, six hundred ninety".