82768991 has 2 divisors, whose sum is σ = 82768992. Its totient is φ = 82768990.

The previous prime is 82768979. The next prime is 82769047. The reversal of 82768991 is 19986728.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 82768991 - 2²² = 78574687 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82768951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41384495 + 41384496.

It is an arithmetic number, because the mean of its divisors is an integer number (41384496).

Almost surely, 2^82768991 is an apocalyptic number.

82768991 is a deficient number, since it is larger than the sum of its proper divisors (1).

82768991 is an equidigital number, since it uses as much as digits as its factorization.

82768991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 50.

The square root of 82768991 is about 9097.7464792112. The cubic root of 82768991 is about 435.8020013215.

The spelling of 82768991 in words is "eighty-two million, seven hundred sixty-eight thousand, nine hundred ninety-one".