81435330 has 48 divisors (see below), whose sum is σ = 222880320. Its totient is φ = 20572704.

The previous prime is 81435329. The next prime is 81435337. The reversal of 81435330 is 3353418.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 81435294 and 81435303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81435337) 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 23 ways as a sum of consecutive naturals, for example, 22102 + ... + 25521.

It is an arithmetic number, because the mean of its divisors is an integer number (4643340).

Almost surely, 2^81435330 is an apocalyptic number.

81435330 is an abundant number, since it is smaller than the sum of its proper divisors (141444990).

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

81435330 is a wasteful number, since it uses less digits than its factorization.

81435330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47655 (or 47652 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 81435330 is about 9024.1525917950. The cubic root of 81435330 is about 433.4486156134.

Adding to 81435330 its reverse (3353418), we get a palindrome (84788748).

The spelling of 81435330 in words is "eighty-one million, four hundred thirty-five thousand, three hundred thirty".