81710208 has 192 divisors, whose sum is σ = 253955520. Its totient is φ = 26127360.

The previous prime is 81710207. The next prime is 81710219. The reversal of 81710208 is 80201718.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (81710207) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1150813 + ... + 1150883.

It is an arithmetic number, because the mean of its divisors is an integer number (1322685).

Almost surely, 2^81710208 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81710208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126977760).

81710208 is an abundant number, since it is smaller than the sum of its proper divisors (172245312).

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

81710208 is an equidigital number, since it uses as much as digits as its factorization.

81710208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137 (or 113 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The square root of 81710208 is about 9039.3698895443. The cubic root of 81710208 is about 433.9357575138.

It can be divided in two parts, 81710 and 208, that added together give a palindrome (81918).

The spelling of 81710208 in words is "eighty-one million, seven hundred ten thousand, two hundred eight".