68028138 has 12 divisors (see below), whose sum is σ = 147394338. Its totient is φ = 22676040.

The previous prime is 68028131. The next prime is 68028161. The reversal of 68028138 is 83182086.

It can be written as a sum of positive squares in only one way, i.e., 68013009 + 15129 = 8247^2 + 123^2 .

It is not an unprimeable number, because it can be changed into a prime (68028131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1889653 + ... + 1889688.

Almost surely, 2^68028138 is an apocalyptic number.

68028138 is an abundant number, since it is smaller than the sum of its proper divisors (79366200).

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

68028138 is a wasteful number, since it uses less digits than its factorization.

68028138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3779349 (or 3779346 counting only the distinct ones).

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

The square root of 68028138 is about 8247.9171916309. The cubic root of 68028138 is about 408.2218012572.

The spelling of 68028138 in words is "sixty-eight million, twenty-eight thousand, one hundred thirty-eight".