68181820 has 24 divisors (see below), whose sum is σ = 163636704. Its totient is φ = 23376576.

The previous prime is 68181809. The next prime is 68181829. The reversal of 68181820 is 2818186.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68181829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 243367 + ... + 243646.

It is an arithmetic number, because the mean of its divisors is an integer number (6818196).

Almost surely, 2^68181820 is an apocalyptic number.

It is an amenable number.

68181820 is an abundant number, since it is smaller than the sum of its proper divisors (95454884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

68181820 is a wasteful number, since it uses less digits than its factorization.

68181820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487029 (or 487027 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 34.

The square root of 68181820 is about 8257.2283485441. The cubic root of 68181820 is about 408.5289739530.

The spelling of 68181820 in words is "sixty-eight million, one hundred eighty-one thousand, eight hundred twenty".