68643220 has 12 divisors (see below), whose sum is σ = 144150804. Its totient is φ = 27457280.

The previous prime is 68643167. The next prime is 68643221. The reversal of 68643220 is 2234686.

It can be written as a sum of positive squares in 2 ways, for example, as 32787076 + 35856144 = 5726^2 + 5988^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68643221) 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, 1716061 + ... + 1716100.

It is an arithmetic number, because the mean of its divisors is an integer number (12012567).

Almost surely, 2^68643220 is an apocalyptic number.

It is an amenable number.

68643220 is an abundant number, since it is smaller than the sum of its proper divisors (75507584).

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

68643220 is a wasteful number, since it uses less digits than its factorization.

68643220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3432170 (or 3432168 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 68643220 is about 8285.1203974354. The cubic root of 68643220 is about 409.4484354013.

The spelling of 68643220 in words is "sixty-eight million, six hundred forty-three thousand, two hundred twenty".