82776257 has 2 divisors, whose sum is σ = 82776258. Its totient is φ = 82776256.

The previous prime is 82776227. The next prime is 82776269. The reversal of 82776257 is 75267728.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78127921 + 4648336 = 8839^2 + 2156^2 .

It is a cyclic number.

It is not a de Polignac number, because 82776257 - 2¹⁰ = 82775233 is a prime.

It is not a weakly prime, because it can be changed into another prime (82776227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41388128 + 41388129.

It is an arithmetic number, because the mean of its divisors is an integer number (41388129).

Almost surely, 2^82776257 is an apocalyptic number.

It is an amenable number.

82776257 is a deficient number, since it is larger than the sum of its proper divisors (1).

82776257 is an equidigital number, since it uses as much as digits as its factorization.

82776257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 329280, while the sum is 44.

The square root of 82776257 is about 9098.1458001067. The cubic root of 82776257 is about 435.8147534591.

The spelling of 82776257 in words is "eighty-two million, seven hundred seventy-six thousand, two hundred fifty-seven".