81528226 has 32 divisors (see below), whose sum is σ = 140555520. Its totient is φ = 35133696.

The previous prime is 81528217. The next prime is 81528229. The reversal of 81528226 is 62282518.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 81528191 and 81528200.

It is not an unprimeable number, because it can be changed into a prime (81528229) 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, 60775 + ... + 62101.

It is an arithmetic number, because the mean of its divisors is an integer number (4392360).

Almost surely, 2^81528226 is an apocalyptic number.

81528226 is a deficient number, since it is larger than the sum of its proper divisors (59027294).

81528226 is a wasteful number, since it uses less digits than its factorization.

81528226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1498.

The product of its digits is 15360, while the sum is 34.

The square root of 81528226 is about 9029.2982008570. The cubic root of 81528226 is about 433.6133694187.

The spelling of 81528226 in words is "eighty-one million, five hundred twenty-eight thousand, two hundred twenty-six".