81433442 has 8 divisors (see below), whose sum is σ = 122248236. Its totient is φ = 40684032.

The previous prime is 81433441. The next prime is 81433447. The reversal of 81433442 is 24433418.

It can be written as a sum of positive squares in 2 ways, for example, as 46635241 + 34798201 = 6829^2 + 5899^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (81433441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13103 + ... + 18290.

Almost surely, 2^81433442 is an apocalyptic number.

81433442 is a deficient number, since it is larger than the sum of its proper divisors (40814794).

81433442 is a wasteful number, since it uses less digits than its factorization.

81433442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32692.

The product of its digits is 9216, while the sum is 29.

The square root of 81433442 is about 9024.0479830285. The cubic root of 81433442 is about 433.4452658907.

The spelling of 81433442 in words is "eighty-one million, four hundred thirty-three thousand, four hundred forty-two".