67998863 has 2 divisors, whose sum is σ = 67998864. Its totient is φ = 67998862.

The previous prime is 67998817. The next prime is 67998907. The reversal of 67998863 is 36889976.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 67998863 - 2¹² = 67994767 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 67998799 and 67998808.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67998803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33999431 + 33999432.

It is an arithmetic number, because the mean of its divisors is an integer number (33999432).

Almost surely, 2^67998863 is an apocalyptic number.

67998863 is a deficient number, since it is larger than the sum of its proper divisors (1).

67998863 is an equidigital number, since it uses as much as digits as its factorization.

67998863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3919104, while the sum is 56.

The square root of 67998863 is about 8246.1423101957. The cubic root of 67998863 is about 408.1632352566.

The spelling of 67998863 in words is "sixty-seven million, nine hundred ninety-eight thousand, eight hundred sixty-three".