82780493 has 2 divisors, whose sum is σ = 82780494. Its totient is φ = 82780492.

The previous prime is 82780487. The next prime is 82780559. The reversal of 82780493 is 39408728.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82773604 + 6889 = 9098^2 + 83^2 .

It is a cyclic number.

It is not a de Polignac number, because 82780493 - 2⁸ = 82780237 is a prime.

It is a super-2 number, since 2×82780493² = 13705220042646098, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 82780493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82780483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41390246 + 41390247.

It is an arithmetic number, because the mean of its divisors is an integer number (41390247).

Almost surely, 2^82780493 is an apocalyptic number.

It is an amenable number.

82780493 is a deficient number, since it is larger than the sum of its proper divisors (1).

82780493 is an equidigital number, since it uses as much as digits as its factorization.

82780493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 82780493 is about 9098.3785918151. The cubic root of 82780493 is about 435.8221874740.

The spelling of 82780493 in words is "eighty-two million, seven hundred eighty thousand, four hundred ninety-three".