81232678 has 4 divisors (see below), whose sum is σ = 121849020. Its totient is φ = 40616338.

The previous prime is 81232651. The next prime is 81232691. The reversal of 81232678 is 87623218.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87623218 = 2 ⋅43811609.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 20308168 + ... + 20308171.

It is an arithmetic number, because the mean of its divisors is an integer number (30462255).

Almost surely, 2^81232678 is an apocalyptic number.

81232678 is a deficient number, since it is larger than the sum of its proper divisors (40616342).

81232678 is a wasteful number, since it uses less digits than its factorization.

81232678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40616341.

The product of its digits is 32256, while the sum is 37.

The square root of 81232678 is about 9012.9172857627. The cubic root of 81232678 is about 433.0887710084.

It can be divided in two parts, 8123 and 2678, that added together give a palindrome (10801).

The spelling of 81232678 in words is "eighty-one million, two hundred thirty-two thousand, six hundred seventy-eight".