68531138 has 16 divisors (see below), whose sum is σ = 116531520. Its totient is φ = 29964816.

The previous prime is 68531137. The next prime is 68531143. The reversal of 68531138 is 83113586.

It is a junction number, because it is equal to n+sod(n) for n = 68531098 and 68531107.

It is not an unprimeable number, because it can be changed into a prime (68531137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68870 + ... + 69857.

It is an arithmetic number, because the mean of its divisors is an integer number (7283220).

Almost surely, 2^68531138 is an apocalyptic number.

68531138 is a deficient number, since it is larger than the sum of its proper divisors (48000382).

68531138 is a wasteful number, since it uses less digits than its factorization.

68531138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138761.

The product of its digits is 17280, while the sum is 35.

The square root of 68531138 is about 8278.3535802719. The cubic root of 68531138 is about 409.2254621788.

The spelling of 68531138 in words is "sixty-eight million, five hundred thirty-one thousand, one hundred thirty-eight".