82791287 has 4 divisors (see below), whose sum is σ = 82816656. Its totient is φ = 82765920.

The previous prime is 82791263. The next prime is 82791301. The reversal of 82791287 is 78219728.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 82791287 - 2⁸ = 82791031 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 (82791217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6914 + ... + 14607.

It is an arithmetic number, because the mean of its divisors is an integer number (20704164).

Almost surely, 2^82791287 is an apocalyptic number.

82791287 is a deficient number, since it is larger than the sum of its proper divisors (25369).

82791287 is a wasteful number, since it uses less digits than its factorization.

82791287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25368.

The product of its digits is 112896, while the sum is 44.

The square root of 82791287 is about 9098.9717550941. The cubic root of 82791287 is about 435.8411293772.

The spelling of 82791287 in words is "eighty-two million, seven hundred ninety-one thousand, two hundred eighty-seven".