72084538 has 4 divisors (see below), whose sum is σ = 108126810. Its totient is φ = 36042268.

The previous prime is 72084533. The next prime is 72084557. The reversal of 72084538 is 83548027.

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., 64593369 + 7491169 = 8037^2 + 2737^2 .

It is a junction number, because it is equal to n+sod(n) for n = 72084497 and 72084506.

It is not an unprimeable number, because it can be changed into a prime (72084533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18021133 + ... + 18021136.

Almost surely, 2^72084538 is an apocalyptic number.

72084538 is a deficient number, since it is larger than the sum of its proper divisors (36042272).

72084538 is a wasteful number, since it uses less digits than its factorization.

72084538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36042271.

The product of its (nonzero) digits is 53760, while the sum is 37.

The square root of 72084538 is about 8490.2613622903. The cubic root of 72084538 is about 416.1795214145.

It can be divided in two parts, 720 and 84538, that added together give a palindrome (85258).

The spelling of 72084538 in words is "seventy-two million, eighty-four thousand, five hundred thirty-eight".