68790257 has 2 divisors, whose sum is σ = 68790258. Its totient is φ = 68790256.

The previous prime is 68790223. The next prime is 68790259. The reversal of 68790257 is 75209786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68574961 + 215296 = 8281^2 + 464^2 .

It is a cyclic number.

It is not a de Polignac number, because 68790257 - 2¹⁰ = 68789233 is a prime.

Together with 68790259, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68790259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34395128 + 34395129.

It is an arithmetic number, because the mean of its divisors is an integer number (34395129).

Almost surely, 2^68790257 is an apocalyptic number.

It is an amenable number.

68790257 is a deficient number, since it is larger than the sum of its proper divisors (1).

68790257 is an equidigital number, since it uses as much as digits as its factorization.

68790257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211680, while the sum is 44.

The square root of 68790257 is about 8293.9892090598. The cubic root of 68790257 is about 409.7405794957.

The spelling of 68790257 in words is "sixty-eight million, seven hundred ninety thousand, two hundred fifty-seven".