68712228 has 72 divisors (see below), whose sum is σ = 191665656. Its totient is φ = 20620800.

The previous prime is 68712211. The next prime is 68712239. The reversal of 68712228 is 82221786.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1340964 + 67371264 = 1158^2 + 8208^2 .

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 68712192 and 68712201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17398 + ... + 20978.

It is an arithmetic number, because the mean of its divisors is an integer number (2662023).

Almost surely, 2^68712228 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 68712228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95832828).

68712228 is an abundant number, since it is smaller than the sum of its proper divisors (122953428).

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

68712228 is a wasteful number, since it uses less digits than its factorization.

68712228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3645 (or 3640 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 68712228 is about 8289.2839256476. The cubic root of 68712228 is about 409.5855975491.

The spelling of 68712228 in words is "sixty-eight million, seven hundred twelve thousand, two hundred twenty-eight".