81708246 has 48 divisors (see below), whose sum is σ = 187565040. Its totient is φ = 25634880.

The previous prime is 81708223. The next prime is 81708269. The reversal of 81708246 is 64280718.

It is an interprime number because it is at equal distance from previous prime (81708223) and next prime (81708269).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 81708246.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58476 + ... + 59856.

It is an arithmetic number, because the mean of its divisors is an integer number (3907605).

Almost surely, 2^81708246 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81708246, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93782520).

81708246 is an abundant number, since it is smaller than the sum of its proper divisors (105856794).

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

81708246 is a wasteful number, since it uses less digits than its factorization.

81708246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1581 (or 1578 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 81708246 is about 9039.2613636292. The cubic root of 81708246 is about 433.9322843093.

The spelling of 81708246 in words is "eighty-one million, seven hundred eight thousand, two hundred forty-six".