81442634 has 32 divisors (see below), whose sum is σ = 153570816. Its totient is φ = 31530240.

The previous prime is 81442619. The next prime is 81442637. The reversal of 81442634 is 43624418.

It is a self number, because there is not a number n which added to its sum of digits gives 81442634.

It is not an unprimeable number, because it can be changed into a prime (81442637) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3794 + ... + 13314.

It is an arithmetic number, because the mean of its divisors is an integer number (4799088).

Almost surely, 2^81442634 is an apocalyptic number.

81442634 is a deficient number, since it is larger than the sum of its proper divisors (72128182).

81442634 is a wasteful number, since it uses less digits than its factorization.

81442634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9590.

The product of its digits is 18432, while the sum is 32.

The square root of 81442634 is about 9024.5572744595. The cubic root of 81442634 is about 433.4615740105.

The spelling of 81442634 in words is "eighty-one million, four hundred forty-two thousand, six hundred thirty-four".