82778347 has 2 divisors, whose sum is σ = 82778348. Its totient is φ = 82778346.

The previous prime is 82778329. The next prime is 82778363. The reversal of 82778347 is 74387728.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82778347 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 82778297 and 82778306.

It is not a weakly prime, because it can be changed into another prime (82778317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41389173 + 41389174.

It is an arithmetic number, because the mean of its divisors is an integer number (41389174).

Almost surely, 2^82778347 is an apocalyptic number.

82778347 is a deficient number, since it is larger than the sum of its proper divisors (1).

82778347 is an equidigital number, since it uses as much as digits as its factorization.

82778347 is an evil number, because the sum of its binary digits is even.

The product of its digits is 526848, while the sum is 46.

The square root of 82778347 is about 9098.2606579500. The cubic root of 82778347 is about 435.8184213593.

The spelling of 82778347 in words is "eighty-two million, seven hundred seventy-eight thousand, three hundred forty-seven".