72784253 has 4 divisors (see below), whose sum is σ = 72804540. Its totient is φ = 72763968.

The previous prime is 72784237. The next prime is 72784273. The reversal of 72784253 is 35248727.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47914084 + 24870169 = 6922^2 + 4987^2 .

It is a cyclic number.

It is not a de Polignac number, because 72784253 - 2⁴ = 72784237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72784223) 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, 3158 + ... + 12471.

It is an arithmetic number, because the mean of its divisors is an integer number (18201135).

Almost surely, 2^72784253 is an apocalyptic number.

It is an amenable number.

72784253 is a deficient number, since it is larger than the sum of its proper divisors (20287).

72784253 is a wasteful number, since it uses less digits than its factorization.

72784253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20286.

The product of its digits is 94080, while the sum is 38.

The square root of 72784253 is about 8531.3687647411. The cubic root of 72784253 is about 417.5217873818.

It can be divided in two parts, 72784 and 253, that added together give a palindrome (73037).

The spelling of 72784253 in words is "seventy-two million, seven hundred eighty-four thousand, two hundred fifty-three".