81716835 has 8 divisors (see below), whose sum is σ = 130746960. Its totient is φ = 43582304.

The previous prime is 81716827. The next prime is 81716851. The reversal of 81716835 is 53861718.

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

It is a cyclic number.

It is not a de Polignac number, because 81716835 - 2³ = 81716827 is a prime.

It is a super-2 number, since 2×81716835² = 13355282244834450, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81716793 and 81716802.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2723880 + ... + 2723909.

It is an arithmetic number, because the mean of its divisors is an integer number (16343370).

Almost surely, 2^81716835 is an apocalyptic number.

81716835 is a deficient number, since it is larger than the sum of its proper divisors (49030125).

81716835 is a wasteful number, since it uses less digits than its factorization.

81716835 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5447797.

The product of its digits is 40320, while the sum is 39.

The square root of 81716835 is about 9039.7364452732. The cubic root of 81716835 is about 433.9474884614.

The spelling of 81716835 in words is "eighty-one million, seven hundred sixteen thousand, eight hundred thirty-five".