79782257 has 2 divisors, whose sum is σ = 79782258. Its totient is φ = 79782256.

The previous prime is 79782253. The next prime is 79782281. The reversal of 79782257 is 75228797.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42523441 + 37258816 = 6521^2 + 6104^2 .

It is a cyclic number.

It is not a de Polignac number, because 79782257 - 2² = 79782253 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (79782253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39891128 + 39891129.

It is an arithmetic number, because the mean of its divisors is an integer number (39891129).

Almost surely, 2^79782257 is an apocalyptic number.

It is an amenable number.

79782257 is a deficient number, since it is larger than the sum of its proper divisors (1).

79782257 is an equidigital number, since it uses as much as digits as its factorization.

79782257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 493920, while the sum is 47.

The square root of 79782257 is about 8932.0914124297. The cubic root of 79782257 is about 430.4956552346.

The spelling of 79782257 in words is "seventy-nine million, seven hundred eighty-two thousand, two hundred fifty-seven".