81272838 has 16 divisors (see below), whose sum is σ = 166326336. Its totient is φ = 26460840.

The previous prime is 81272833. The next prime is 81272839. The reversal of 81272838 is 83827218.

It is a junction number, because it is equal to n+sod(n) for n = 81272796 and 81272805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81272833) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157248 + ... + 157763.

It is an arithmetic number, because the mean of its divisors is an integer number (10395396).

Almost surely, 2^81272838 is an apocalyptic number.

81272838 is an abundant number, since it is smaller than the sum of its proper divisors (85053498).

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

81272838 is a wasteful number, since it uses less digits than its factorization.

81272838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315059.

The product of its digits is 43008, while the sum is 39.

The square root of 81272838 is about 9015.1449239599. The cubic root of 81272838 is about 433.1601297277.

The spelling of 81272838 in words is "eighty-one million, two hundred seventy-two thousand, eight hundred thirty-eight".