8181409536 has 162 divisors, whose sum is σ = 24500074872. Its totient is φ = 2726576640.

The previous prime is 8181409471. The next prime is 8181409541. The reversal of 8181409536 is 6359041818.

It is a tau number, because it is divible by the number of its divisors (162).

It is a junction number, because it is equal to n+sod(n) for n = 8181409491 and 8181409500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1677181 + ... + 1682051.

Almost surely, 2^8181409536 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 8181409536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12250037436).

8181409536 is an abundant number, since it is smaller than the sum of its proper divisors (16318665336).

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

8181409536 is an frugal number, since it uses more digits than its factorization.

8181409536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4911 (or 4876 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The square root of 8181409536 is about 90451.1444703714. The cubic root of 8181409536 is about 2015.0046106535.

The spelling of 8181409536 in words is "eight billion, one hundred eighty-one million, four hundred nine thousand, five hundred thirty-six".