68391236 has 18 divisors (see below), whose sum is σ = 125118462. Its totient is φ = 32707840.

The previous prime is 68391229. The next prime is 68391277. The reversal of 68391236 is 63219386.

It can be written as a sum of positive squares in only one way, i.e., 54848836 + 13542400 = 7406^2 + 3680^2 .

It is a super-2 number, since 2×68391236² = 9354722323215392, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 68391236.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14045 + ... + 18276.

Almost surely, 2^68391236 is an apocalyptic number.

It is an amenable number.

68391236 is a deficient number, since it is larger than the sum of its proper divisors (56727226).

68391236 is a wasteful number, since it uses less digits than its factorization.

68391236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32371 (or 32346 counting only the distinct ones).

The product of its digits is 46656, while the sum is 38.

The square root of 68391236 is about 8269.8993947931. The cubic root of 68391236 is about 408.9468031393.

It can be divided in two parts, 683 and 91236, that added together give a palindrome (91919).

The spelling of 68391236 in words is "sixty-eight million, three hundred ninety-one thousand, two hundred thirty-six".