68940857 has 2 divisors, whose sum is σ = 68940858. Its totient is φ = 68940856.

The previous prime is 68940853. The next prime is 68940881. The reversal of 68940857 is 75804986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51208336 + 17732521 = 7156^2 + 4211^2 .

It is a cyclic number.

It is not a de Polignac number, because 68940857 - 2² = 68940853 is a prime.

It is not a weakly prime, because it can be changed into another prime (68940853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34470428 + 34470429.

It is an arithmetic number, because the mean of its divisors is an integer number (34470429).

Almost surely, 2^68940857 is an apocalyptic number.

It is an amenable number.

68940857 is a deficient number, since it is larger than the sum of its proper divisors (1).

68940857 is an equidigital number, since it uses as much as digits as its factorization.

68940857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 483840, while the sum is 47.

The square root of 68940857 is about 8303.0631094795. The cubic root of 68940857 is about 410.0393715909.

The spelling of 68940857 in words is "sixty-eight million, nine hundred forty thousand, eight hundred fifty-seven".