72040522 has 4 divisors (see below), whose sum is σ = 108060786. Its totient is φ = 36020260.

The previous prime is 72040489. The next prime is 72040541. The reversal of 72040522 is 22504027.

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., 57592921 + 14447601 = 7589^2 + 3801^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 72040493 and 72040502.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18010129 + ... + 18010132.

Almost surely, 2^72040522 is an apocalyptic number.

72040522 is a deficient number, since it is larger than the sum of its proper divisors (36020264).

72040522 is a wasteful number, since it uses less digits than its factorization.

72040522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36020263.

The product of its (nonzero) digits is 1120, while the sum is 22.

The square root of 72040522 is about 8487.6688201178. The cubic root of 72040522 is about 416.0947954889.

Adding to 72040522 its reverse (22504027), we get a palindrome (94544549).

The spelling of 72040522 in words is "seventy-two million, forty thousand, five hundred twenty-two".