681158228 has 6 divisors (see below), whose sum is σ = 1192026906. Its totient is φ = 340579112.

The previous prime is 681158221. The next prime is 681158243. The reversal of 681158228 is 822851186.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 595262404 + 85895824 = 24398^2 + 9268^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681158221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85144775 + ... + 85144782.

It is an arithmetic number, because the mean of its divisors is an integer number (198671151).

Almost surely, 2^681158228 is an apocalyptic number.

It is an amenable number.

681158228 is a deficient number, since it is larger than the sum of its proper divisors (510868678).

681158228 is a wasteful number, since it uses less digits than its factorization.

681158228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170289561 (or 170289559 counting only the distinct ones).

The product of its digits is 61440, while the sum is 41.

The square root of 681158228 is about 26099.0081803888. The cubic root of 681158228 is about 879.8649190043.

The spelling of 681158228 in words is "six hundred eighty-one million, one hundred fifty-eight thousand, two hundred twenty-eight".