81089748 has 60 divisors (see below), whose sum is σ = 212884980. Its totient is φ = 26915328.

The previous prime is 81089747. The next prime is 81089753. The reversal of 81089748 is 84798018.

It can be written as a sum of positive squares in 2 ways, for example, as 20903184 + 60186564 = 4572^2 + 7758^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81089747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 114018 + ... + 114726.

It is an arithmetic number, because the mean of its divisors is an integer number (3548083).

Almost surely, 2^81089748 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 81089748, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106442490).

81089748 is an abundant number, since it is smaller than the sum of its proper divisors (131795232).

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

81089748 is a wasteful number, since it uses less digits than its factorization.

81089748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1078 (or 1067 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The square root of 81089748 is about 9004.9846196426. The cubic root of 81089748 is about 432.8346133610.

The spelling of 81089748 in words is "eighty-one million, eighty-nine thousand, seven hundred forty-eight".