68538220 has 48 divisors (see below), whose sum is σ = 155675520. Its totient is φ = 25247744.

The previous prime is 68538209. The next prime is 68538221. The reversal of 68538220 is 2283586.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (68538221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13836 + ... + 18124.

It is an arithmetic number, because the mean of its divisors is an integer number (3243240).

Almost surely, 2^68538220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68538220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77837760).

68538220 is an abundant number, since it is smaller than the sum of its proper divisors (87137300).

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

68538220 is a wasteful number, since it uses less digits than its factorization.

68538220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4362 (or 4360 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 68538220 is about 8278.7813112801. The cubic root of 68538220 is about 409.2395581308.

The spelling of 68538220 in words is "sixty-eight million, five hundred thirty-eight thousand, two hundred twenty".