81710228 has 24 divisors (see below), whose sum is σ = 151842600. Its totient is φ = 38340608.

The previous prime is 81710227. The next prime is 81710231. The reversal of 81710228 is 82201718.

It can be written as a sum of positive squares in 4 ways, for example, as 29899024 + 51811204 = 5468^2 + 7198^2 .

It is a super-2 number, since 2×81710228² = 13353122719623968, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81710228.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81710227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24908 + ... + 27996.

It is an arithmetic number, because the mean of its divisors is an integer number (6326775).

Almost surely, 2^81710228 is an apocalyptic number.

It is an amenable number.

81710228 is a deficient number, since it is larger than the sum of its proper divisors (70132372).

81710228 is a wasteful number, since it uses less digits than its factorization.

81710228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3499 (or 3497 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 81710228 is about 9039.3709958160. The cubic root of 81710228 is about 433.9357929182.

The spelling of 81710228 in words is "eighty-one million, seven hundred ten thousand, two hundred twenty-eight".