68861813 has 4 divisors (see below), whose sum is σ = 69404160. Its totient is φ = 68319468.

The previous prime is 68861801. The next prime is 68861831. The reversal of 68861813 is 31816886.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 68861813 - 2⁴ = 68861797 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 (68861843) 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, 270983 + ... + 271236.

It is an arithmetic number, because the mean of its divisors is an integer number (17351040).

Almost surely, 2^68861813 is an apocalyptic number.

It is an amenable number.

68861813 is a deficient number, since it is larger than the sum of its proper divisors (542347).

68861813 is a wasteful number, since it uses less digits than its factorization.

68861813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542346.

The product of its digits is 55296, while the sum is 41.

The square root of 68861813 is about 8298.3018142268. The cubic root of 68861813 is about 409.8826017238.

The spelling of 68861813 in words is "sixty-eight million, eight hundred sixty-one thousand, eight hundred thirteen".