81433536 has 112 divisors (see below), whose sum is σ = 232440480. Its totient is φ = 25067520.

The previous prime is 81433507. The next prime is 81433607. The reversal of 81433536 is 63533418.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 81433497 and 81433506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 198900 + ... + 199308.

Almost surely, 2^81433536 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 81433536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116220240).

81433536 is an abundant number, since it is smaller than the sum of its proper divisors (151006944).

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

81433536 is a wasteful number, since it uses less digits than its factorization.

81433536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502 (or 492 counting only the distinct ones).

The product of its digits is 25920, while the sum is 33.

The square root of 81433536 is about 9024.0531913326. The cubic root of 81433536 is about 433.4454326684.

The spelling of 81433536 in words is "eighty-one million, four hundred thirty-three thousand, five hundred thirty-six".