81272882 has 8 divisors (see below), whose sum is σ = 123116652. Its totient is φ = 40234000.

The previous prime is 81272857. The next prime is 81272887. The reversal of 81272882 is 28827218.

It can be written as a sum of positive squares in 2 ways, for example, as 80442961 + 829921 = 8969^2 + 911^2 .

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 (81272887) 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, 200969 + ... + 201372.

Almost surely, 2^81272882 is an apocalyptic number.

81272882 is a deficient number, since it is larger than the sum of its proper divisors (41843770).

81272882 is a wasteful number, since it uses less digits than its factorization.

81272882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402444.

The product of its digits is 28672, while the sum is 38.

The square root of 81272882 is about 9015.1473642975. The cubic root of 81272882 is about 433.1602078967.

The spelling of 81272882 in words is "eighty-one million, two hundred seventy-two thousand, eight hundred eighty-two".