82787791 has 4 divisors (see below), whose sum is σ = 82897912. Its totient is φ = 82677672.

The previous prime is 82787777. The next prime is 82787801. The reversal of 82787791 is 19778728.

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 82787791 - 2⁹ = 82787279 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 (82787591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53925 + ... + 55438.

It is an arithmetic number, because the mean of its divisors is an integer number (20724478).

Almost surely, 2^82787791 is an apocalyptic number.

82787791 is a deficient number, since it is larger than the sum of its proper divisors (110121).

82787791 is a wasteful number, since it uses less digits than its factorization.

82787791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110120.

The product of its digits is 395136, while the sum is 49.

The square root of 82787791 is about 9098.7796434467. The cubic root of 82787791 is about 435.8349945849.

The spelling of 82787791 in words is "eighty-two million, seven hundred eighty-seven thousand, seven hundred ninety-one".