81596436 has 24 divisors (see below), whose sum is σ = 190821120. Its totient is φ = 27137472.

The previous prime is 81596377. The next prime is 81596461. The reversal of 81596436 is 63469518.

81596436 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

81596436 is strictly pandigital in base 9.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1956 + ... + 12923.

It is an arithmetic number, because the mean of its divisors is an integer number (7950880).

Almost surely, 2^81596436 is an apocalyptic number.

It is an amenable number.

81596436 is an abundant number, since it is smaller than the sum of its proper divisors (109224684).

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

81596436 is a wasteful number, since it uses less digits than its factorization.

81596436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15343 (or 15341 counting only the distinct ones).

The product of its digits is 155520, while the sum is 42.

The square root of 81596436 is about 9033.0745596391. The cubic root of 81596436 is about 433.7342622056.

The spelling of 81596436 in words is "eighty-one million, five hundred ninety-six thousand, four hundred thirty-six".