81662235 has 8 divisors (see below), whose sum is σ = 130659600. Its totient is φ = 43553184.

The previous prime is 81662227. The next prime is 81662249. The reversal of 81662235 is 53226618.

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

It is not a de Polignac number, because 81662235 - 2³ = 81662227 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81662196 and 81662205.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2722060 + ... + 2722089.

It is an arithmetic number, because the mean of its divisors is an integer number (16332450).

Almost surely, 2^81662235 is an apocalyptic number.

81662235 is a deficient number, since it is larger than the sum of its proper divisors (48997365).

81662235 is a wasteful number, since it uses less digits than its factorization.

81662235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5444157.

The product of its digits is 17280, while the sum is 33.

The square root of 81662235 is about 9036.7159410928. The cubic root of 81662235 is about 433.8508180024.

It can be divided in two parts, 8166 and 2235, that added together give a palindrome (10401).

The spelling of 81662235 in words is "eighty-one million, six hundred sixty-two thousand, two hundred thirty-five".