81822270 has 32 divisors (see below), whose sum is σ = 204913152. Its totient is φ = 20870432.

The previous prime is 81822187. The next prime is 81822271. The reversal of 81822270 is 7222818.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81822271) 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 15 ways as a sum of consecutive naturals, for example, 58602 + ... + 59981.

It is an arithmetic number, because the mean of its divisors is an integer number (6403536).

Almost surely, 2^81822270 is an apocalyptic number.

81822270 is an abundant number, since it is smaller than the sum of its proper divisors (123090882).

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

81822270 is a wasteful number, since it uses less digits than its factorization.

81822270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118616.

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 81822270 is about 9045.5663172628. The cubic root of 81822270 is about 434.1340415744.

The spelling of 81822270 in words is "eighty-one million, eight hundred twenty-two thousand, two hundred seventy".