68860639 has 2 divisors, whose sum is σ = 68860640. Its totient is φ = 68860638.

The previous prime is 68860637. The next prime is 68860651. The reversal of 68860639 is 93606886.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68860639 - 2¹ = 68860637 is a prime.

Together with 68860637, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68860633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34430319 + 34430320.

It is an arithmetic number, because the mean of its divisors is an integer number (34430320).

Almost surely, 2^68860639 is an apocalyptic number.

68860639 is a deficient number, since it is larger than the sum of its proper divisors (1).

68860639 is an equidigital number, since it uses as much as digits as its factorization.

68860639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 46.

The square root of 68860639 is about 8298.2310765608. The cubic root of 68860639 is about 409.8802723975.

The spelling of 68860639 in words is "sixty-eight million, eight hundred sixty thousand, six hundred thirty-nine".