68260639 has 2 divisors, whose sum is σ = 68260640. Its totient is φ = 68260638.

The previous prime is 68260637. The next prime is 68260649. The reversal of 68260639 is 93606286.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68260639 - 2¹ = 68260637 is a prime.

Together with 68260637, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68260631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34130319 + 34130320.

It is an arithmetic number, because the mean of its divisors is an integer number (34130320).

Almost surely, 2^68260639 is an apocalyptic number.

68260639 is a deficient number, since it is larger than the sum of its proper divisors (1).

68260639 is an equidigital number, since it uses as much as digits as its factorization.

68260639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 68260639 is about 8261.9996974098. Note that the first 3 decimals coincide. The cubic root of 68260639 is about 408.6863347928.

The spelling of 68260639 in words is "sixty-eight million, two hundred sixty thousand, six hundred thirty-nine".