81838255 has 32 divisors (see below), whose sum is σ = 111259008. Its totient is φ = 57446400.

The previous prime is 81838247. The next prime is 81838277. The reversal of 81838255 is 55283818.

It is not a de Polignac number, because 81838255 - 2³ = 81838247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 79645 + ... + 80665.

It is an arithmetic number, because the mean of its divisors is an integer number (3476844).

Almost surely, 2^81838255 is an apocalyptic number.

81838255 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

81838255 is a deficient number, since it is larger than the sum of its proper divisors (29420753).

81838255 is a wasteful number, since it uses less digits than its factorization.

81838255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1107.

The product of its digits is 76800, while the sum is 40.

The square root of 81838255 is about 9046.4498561590. The cubic root of 81838255 is about 434.1623108984.

The spelling of 81838255 in words is "eighty-one million, eight hundred thirty-eight thousand, two hundred fifty-five".