81708299 has 8 divisors (see below), whose sum is σ = 83804160. Its totient is φ = 79621416.

The previous prime is 81708269. The next prime is 81708301. The reversal of 81708299 is 99280718.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81708299 is a prime.

It is a super-2 number, since 2×81708299² = 13352492250946802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81708269) 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, 18614 + ... + 22580.

It is an arithmetic number, because the mean of its divisors is an integer number (10475520).

Almost surely, 2^81708299 is an apocalyptic number.

81708299 is a deficient number, since it is larger than the sum of its proper divisors (2095861).

81708299 is a wasteful number, since it uses less digits than its factorization.

81708299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4489.

The product of its (nonzero) digits is 72576, while the sum is 44.

The square root of 81708299 is about 9039.2642952842. The cubic root of 81708299 is about 433.9323781326.

The spelling of 81708299 in words is "eighty-one million, seven hundred eight thousand, two hundred ninety-nine".