82716991 has 8 divisors (see below), whose sum is σ = 94592160. Its totient is φ = 70856448.

The previous prime is 82716979. The next prime is 82717001. The reversal of 82716991 is 19961728.

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 82716991 - 2⁹ = 82716479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82716911) 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, 14475 + ... + 19363.

It is an arithmetic number, because the mean of its divisors is an integer number (11824020).

Almost surely, 2^82716991 is an apocalyptic number.

82716991 is a deficient number, since it is larger than the sum of its proper divisors (11875169).

82716991 is a wasteful number, since it uses less digits than its factorization.

82716991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7313.

The product of its digits is 54432, while the sum is 43.

The square root of 82716991 is about 9094.8881796315. Note that the first 3 decimals coincide. The cubic root of 82716991 is about 435.7107173304.

The spelling of 82716991 in words is "eighty-two million, seven hundred sixteen thousand, nine hundred ninety-one".