72025138 has 4 divisors (see below), whose sum is σ = 108037710. Its totient is φ = 36012568.

The previous prime is 72025127. The next prime is 72025139. The reversal of 72025138 is 83152027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83152027 = 7 ⋅11878861.

It can be written as a sum of positive squares in only one way, i.e., 63632529 + 8392609 = 7977^2 + 2897^2 .

It is not an unprimeable number, because it can be changed into a prime (72025139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18006283 + ... + 18006286.

Almost surely, 2^72025138 is an apocalyptic number.

72025138 is a deficient number, since it is larger than the sum of its proper divisors (36012572).

72025138 is a wasteful number, since it uses less digits than its factorization.

72025138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36012571.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 72025138 is about 8486.7625158243. The cubic root of 72025138 is about 416.0651748538.

The spelling of 72025138 in words is "seventy-two million, twenty-five thousand, one hundred thirty-eight".