68408257 has 2 divisors, whose sum is σ = 68408258. Its totient is φ = 68408256.

The previous prime is 68408243. The next prime is 68408281. The reversal of 68408257 is 75280486.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66601921 + 1806336 = 8161^2 + 1344^2 .

It is a cyclic number.

It is not a de Polignac number, because 68408257 - 2¹⁹ = 67883969 is a prime.

It is not a weakly prime, because it can be changed into another prime (68408297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34204128 + 34204129.

It is an arithmetic number, because the mean of its divisors is an integer number (34204129).

Almost surely, 2^68408257 is an apocalyptic number.

It is an amenable number.

68408257 is a deficient number, since it is larger than the sum of its proper divisors (1).

68408257 is an equidigital number, since it uses as much as digits as its factorization.

68408257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 107520, while the sum is 40.

The square root of 68408257 is about 8270.9284243064. The cubic root of 68408257 is about 408.9807261319.

The spelling of 68408257 in words is "sixty-eight million, four hundred eight thousand, two hundred fifty-seven".