68813639 has 2 divisors, whose sum is σ = 68813640. Its totient is φ = 68813638.

The previous prime is 68813617. The next prime is 68813681. The reversal of 68813639 is 93631886.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68813639 - 2²⁰ = 67765063 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68813639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68813609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34406819 + 34406820.

It is an arithmetic number, because the mean of its divisors is an integer number (34406820).

Almost surely, 2^68813639 is an apocalyptic number.

68813639 is a deficient number, since it is larger than the sum of its proper divisors (1).

68813639 is an equidigital number, since it uses as much as digits as its factorization.

68813639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 44.

The square root of 68813639 is about 8295.3986643199. The cubic root of 68813639 is about 409.7869982250.

The spelling of 68813639 in words is "sixty-eight million, eight hundred thirteen thousand, six hundred thirty-nine".