72530503 has 4 divisors (see below), whose sum is σ = 72613528. Its totient is φ = 72447480.

The previous prime is 72530473. The next prime is 72530509. The reversal of 72530503 is 30503527.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72530503 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 (72530509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40188 + ... + 41953.

It is an arithmetic number, because the mean of its divisors is an integer number (18153382).

Almost surely, 2^72530503 is an apocalyptic number.

72530503 is a deficient number, since it is larger than the sum of its proper divisors (83025).

72530503 is an equidigital number, since it uses as much as digits as its factorization.

72530503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83024.

The product of its (nonzero) digits is 3150, while the sum is 25.

The square root of 72530503 is about 8516.4841924353. The cubic root of 72530503 is about 417.0360160355.

The spelling of 72530503 in words is "seventy-two million, five hundred thirty thousand, five hundred three".