81872422 has 8 divisors (see below), whose sum is σ = 122852016. Its totient is φ = 40921752.

The previous prime is 81872419. The next prime is 81872429. The reversal of 81872422 is 22427818.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81872429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2428 + ... + 13024.

It is an arithmetic number, because the mean of its divisors is an integer number (15356502).

Almost surely, 2^81872422 is an apocalyptic number.

81872422 is a deficient number, since it is larger than the sum of its proper divisors (40979594).

81872422 is a wasteful number, since it uses less digits than its factorization.

81872422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14462.

The product of its digits is 14336, while the sum is 34.

The square root of 81872422 is about 9048.3380794486. The cubic root of 81872422 is about 434.2227225799. Note that the first 3 decimals are identical.

It can be divided in two parts, 8187 and 2422, that added together give a square (10609 = 103²).

The spelling of 81872422 in words is "eighty-one million, eight hundred seventy-two thousand, four hundred twenty-two".