68231808 has 80 divisors (see below), whose sum is σ = 203087610. Its totient is φ = 22740480.

The previous prime is 68231803. The next prime is 68231819. The reversal of 68231808 is 80813286.

It can be written as a sum of positive squares in only one way, i.e., 63872064 + 4359744 = 7992^2 + 2088^2 .

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

It is not an unprimeable number, because it can be changed into a prime (68231803) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 7078 + ... + 13658.

Almost surely, 2^68231808 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 68231808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101543805).

68231808 is an abundant number, since it is smaller than the sum of its proper divisors (134855802).

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

68231808 is an equidigital number, since it uses as much as digits as its factorization.

68231808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6607 (or 6586 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 68231808 is about 8260.2547176222. The cubic root of 68231808 is about 408.6287882322.

The spelling of 68231808 in words is "sixty-eight million, two hundred thirty-one thousand, eight hundred eight".