68072138 has 4 divisors (see below), whose sum is σ = 102108210. Its totient is φ = 34036068.

The previous prime is 68072107. The next prime is 68072143. The reversal of 68072138 is 83127086.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 59644729 + 8427409 = 7723^2 + 2903^2 .

It is a junction number, because it is equal to n+sod(n) for n = 68072098 and 68072107.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17018033 + ... + 17018036.

Almost surely, 2^68072138 is an apocalyptic number.

68072138 is a deficient number, since it is larger than the sum of its proper divisors (34036072).

68072138 is a wasteful number, since it uses less digits than its factorization.

68072138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34036071.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 68072138 is about 8250.5841005349. The cubic root of 68072138 is about 408.3097937099.

The spelling of 68072138 in words is "sixty-eight million, seventy-two thousand, one hundred thirty-eight".