81433775 has 12 divisors (see below), whose sum is σ = 101980824. Its totient is φ = 64500000.

The previous prime is 81433739. The next prime is 81433799. The reversal of 81433775 is 57733418.

It is not a de Polignac number, because 81433775 - 2²⁶ = 14324911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13601 + ... + 18650.

It is an arithmetic number, because the mean of its divisors is an integer number (8498402).

Almost surely, 2^81433775 is an apocalyptic number.

81433775 is a deficient number, since it is larger than the sum of its proper divisors (20547049).

81433775 is a wasteful number, since it uses less digits than its factorization.

81433775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32362 (or 32357 counting only the distinct ones).

The product of its digits is 70560, while the sum is 38.

The square root of 81433775 is about 9024.0664337094. The cubic root of 81433775 is about 433.4458567089.

The spelling of 81433775 in words is "eighty-one million, four hundred thirty-three thousand, seven hundred seventy-five".