68981863 has 4 divisors (see below), whose sum is σ = 69000048. Its totient is φ = 68963680.

The previous prime is 68981833. The next prime is 68981873. The reversal of 68981863 is 36818986.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36818986 = 2 ⋅18409493.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68981863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68981813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1003 + ... + 11788.

It is an arithmetic number, because the mean of its divisors is an integer number (17250012).

Almost surely, 2^68981863 is an apocalyptic number.

68981863 is a deficient number, since it is larger than the sum of its proper divisors (18185).

68981863 is a wasteful number, since it uses less digits than its factorization.

68981863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18184.

The product of its digits is 497664, while the sum is 49.

The square root of 68981863 is about 8305.5320720590. The cubic root of 68981863 is about 410.1206525740.

The spelling of 68981863 in words is "sixty-eight million, nine hundred eighty-one thousand, eight hundred sixty-three".