72540453 has 4 divisors (see below), whose sum is σ = 96720608. Its totient is φ = 48360300.

The previous prime is 72540449. The next prime is 72540469. The reversal of 72540453 is 35404527.

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, and also an emirpimes, since its reverse is a distinct semiprime: 35404527 = 3 ⋅11801509.

It is not a de Polignac number, because 72540453 - 2² = 72540449 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72540453.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72540443) 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, 12090073 + ... + 12090078.

It is an arithmetic number, because the mean of its divisors is an integer number (24180152).

Almost surely, 2^72540453 is an apocalyptic number.

It is an amenable number.

72540453 is a deficient number, since it is larger than the sum of its proper divisors (24180155).

72540453 is a wasteful number, since it uses less digits than its factorization.

72540453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24180154.

The product of its (nonzero) digits is 16800, while the sum is 30.

The square root of 72540453 is about 8517.0683336463. The cubic root of 72540453 is about 417.0550853395.

The spelling of 72540453 in words is "seventy-two million, five hundred forty thousand, four hundred fifty-three".