72253540 has 12 divisors (see below), whose sum is σ = 151732476. Its totient is φ = 28901408.

The previous prime is 72253513. The next prime is 72253541. The reversal of 72253540 is 4535227.

It can be written as a sum of positive squares in 2 ways, for example, as 9400356 + 62853184 = 3066^2 + 7928^2 .

It is a junction number, because it is equal to n+sod(n) for n = 72253499 and 72253508.

It is not an unprimeable number, because it can be changed into a prime (72253541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1806319 + ... + 1806358.

It is an arithmetic number, because the mean of its divisors is an integer number (12644373).

Almost surely, 2^72253540 is an apocalyptic number.

It is an amenable number.

72253540 is an abundant number, since it is smaller than the sum of its proper divisors (79478936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72253540 is a wasteful number, since it uses less digits than its factorization.

72253540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3612686 (or 3612684 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 28.

The square root of 72253540 is about 8500.2082327435. The cubic root of 72253540 is about 416.5045114796.

Adding to 72253540 its reverse (4535227), we get a palindrome (76788767).

The spelling of 72253540 in words is "seventy-two million, two hundred fifty-three thousand, five hundred forty".