67856389 has 2 divisors, whose sum is σ = 67856390. Its totient is φ = 67856388.

The previous prime is 67856381. The next prime is 67856407. The reversal of 67856389 is 98365876.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61936900 + 5919489 = 7870^2 + 2433^2 .

It is a cyclic number.

It is not a de Polignac number, because 67856389 - 2³ = 67856381 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67856381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33928194 + 33928195.

It is an arithmetic number, because the mean of its divisors is an integer number (33928195).

Almost surely, 2^67856389 is an apocalyptic number.

It is an amenable number.

67856389 is a deficient number, since it is larger than the sum of its proper divisors (1).

67856389 is an equidigital number, since it uses as much as digits as its factorization.

67856389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2177280, while the sum is 52.

The square root of 67856389 is about 8237.4989529590. The cubic root of 67856389 is about 407.8779691597.

The spelling of 67856389 in words is "sixty-seven million, eight hundred fifty-six thousand, three hundred eighty-nine".