68639442 has 16 divisors (see below), whose sum is σ = 137496960. Its totient is φ = 22843472.

The previous prime is 68639437. The next prime is 68639443. The reversal of 68639442 is 24493686.

It is a happy number.

It is a super-2 number, since 2×68639442² = 9422745996142728, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 68639394 and 68639403.

It is not an unprimeable number, because it can be changed into a prime (68639443) 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 in 7 ways as a sum of consecutive naturals, for example, 4842 + ... + 12677.

It is an arithmetic number, because the mean of its divisors is an integer number (8593560).

Almost surely, 2^68639442 is an apocalyptic number.

68639442 is an abundant number, since it is smaller than the sum of its proper divisors (68857518).

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

68639442 is a wasteful number, since it uses less digits than its factorization.

68639442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18177.

The product of its digits is 248832, while the sum is 42.

The square root of 68639442 is about 8284.8923951974. The cubic root of 68639442 is about 409.4409234938.

The spelling of 68639442 in words is "sixty-eight million, six hundred thirty-nine thousand, four hundred forty-two".