72581453 has 4 divisors (see below), whose sum is σ = 82950240. Its totient is φ = 62212668.

The previous prime is 72581413. The next prime is 72581459. The reversal of 72581453 is 35418527.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-72581453 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 (72581459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5184383 + ... + 5184396.

It is an arithmetic number, because the mean of its divisors is an integer number (20737560).

Almost surely, 2^72581453 is an apocalyptic number.

It is an amenable number.

72581453 is a deficient number, since it is larger than the sum of its proper divisors (10368787).

72581453 is a wasteful number, since it uses less digits than its factorization.

72581453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10368786.

The product of its digits is 33600, while the sum is 35.

The square root of 72581453 is about 8519.4749251348. The cubic root of 72581453 is about 417.1336439795.

The spelling of 72581453 in words is "seventy-two million, five hundred eighty-one thousand, four hundred fifty-three".