68861887 has 2 divisors, whose sum is σ = 68861888. Its totient is φ = 68861886.

The previous prime is 68861873. The next prime is 68861899. The reversal of 68861887 is 78816886.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68861887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68861857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34430943 + 34430944.

It is an arithmetic number, because the mean of its divisors is an integer number (34430944).

Almost surely, 2^68861887 is an apocalyptic number.

68861887 is a deficient number, since it is larger than the sum of its proper divisors (1).

68861887 is an equidigital number, since it uses as much as digits as its factorization.

68861887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1032192, while the sum is 52.

The square root of 68861887 is about 8298.3062729692. The cubic root of 68861887 is about 409.8827485459.

The spelling of 68861887 in words is "sixty-eight million, eight hundred sixty-one thousand, eight hundred eighty-seven".