81089019648 has 720 divisors, whose sum is σ = 304010660800. Its totient is φ = 21361729536.

The previous prime is 81089019629. The next prime is 81089019653. The reversal of 81089019648 is 84691098018.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 81089019594 and 81089019603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 92461386 + ... + 92462262.

Almost surely, 2^81089019648 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 81089019648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (152005330400).

81089019648 is an abundant number, since it is smaller than the sum of its proper divisors (222921641152).

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

81089019648 is an equidigital number, since it uses as much as digits as its factorization.

81089019648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 939 (or 902 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 54.

The spelling of 81089019648 in words is "eighty-one billion, eighty-nine million, nineteen thousand, six hundred forty-eight".