82457779 has 2 divisors, whose sum is σ = 82457780. Its totient is φ = 82457778.

The previous prime is 82457743. The next prime is 82457827. The reversal of 82457779 is 97775428.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 82457779 - 2⁹ = 82457267 is a prime.

It is a super-2 number, since 2×82457779² = 13598570635225682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (82557779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41228889 + 41228890.

It is an arithmetic number, because the mean of its divisors is an integer number (41228890).

Almost surely, 2^82457779 is an apocalyptic number.

82457779 is a deficient number, since it is larger than the sum of its proper divisors (1).

82457779 is an equidigital number, since it uses as much as digits as its factorization.

82457779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 987840, while the sum is 49.

The square root of 82457779 is about 9080.6265752975. The cubic root of 82457779 is about 435.2551090909.

The spelling of 82457779 in words is "eighty-two million, four hundred fifty-seven thousand, seven hundred seventy-nine".