81090249592 has 48 divisors (see below), whose sum is σ = 167255804520. Its totient is φ = 36829911360.

The previous prime is 81090249589. The next prime is 81090249629. The reversal of 81090249592 is 29594209018.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1209298 + ... + 1274590.

Almost surely, 2^81090249592 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81090249592, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83627902260).

81090249592 is an abundant number, since it is smaller than the sum of its proper divisors (86165554928).

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

81090249592 is a wasteful number, since it uses less digits than its factorization.

81090249592 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66604 (or 66589 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 49.

The spelling of 81090249592 in words is "eighty-one billion, ninety million, two hundred forty-nine thousand, five hundred ninety-two".