72968138 has 4 divisors (see below), whose sum is σ = 109452210. Its totient is φ = 36484068.

The previous prime is 72968123. The next prime is 72968143. The reversal of 72968138 is 83186927.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83186927 = 4801 ⋅17327.

It can be written as a sum of positive squares in only one way, i.e., 72199009 + 769129 = 8497^2 + 877^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18242033 + ... + 18242036.

Almost surely, 2^72968138 is an apocalyptic number.

72968138 is a deficient number, since it is larger than the sum of its proper divisors (36484072).

72968138 is a wasteful number, since it uses less digits than its factorization.

72968138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36484071.

The product of its digits is 145152, while the sum is 44.

The square root of 72968138 is about 8542.1389593005. The cubic root of 72968138 is about 417.8731061752.

The spelling of 72968138 in words is "seventy-two million, nine hundred sixty-eight thousand, one hundred thirty-eight".