81268873 has 4 divisors (see below), whose sum is σ = 92878720. Its totient is φ = 69659028.

The previous prime is 81268861. The next prime is 81268877. The reversal of 81268873 is 37886218.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81268873 - 2¹³ = 81260681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81268877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5804913 + ... + 5804926.

It is an arithmetic number, because the mean of its divisors is an integer number (23219680).

Almost surely, 2^81268873 is an apocalyptic number.

It is an amenable number.

81268873 is a deficient number, since it is larger than the sum of its proper divisors (11609847).

81268873 is a wasteful number, since it uses less digits than its factorization.

81268873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11609846.

The product of its digits is 129024, while the sum is 43.

The square root of 81268873 is about 9014.9250135539. The cubic root of 81268873 is about 433.1530855217.

The spelling of 81268873 in words is "eighty-one million, two hundred sixty-eight thousand, eight hundred seventy-three".