72503501 has 4 divisors (see below), whose sum is σ = 82861152. Its totient is φ = 62145852.

The previous prime is 72503491. The next prime is 72503503. The reversal of 72503501 is 10530527.

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 cyclic number.

It is not a de Polignac number, because 72503501 - 2⁶ = 72503437 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72503503) 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, 5178815 + ... + 5178828.

It is an arithmetic number, because the mean of its divisors is an integer number (20715288).

Almost surely, 2^72503501 is an apocalyptic number.

It is an amenable number.

72503501 is a deficient number, since it is larger than the sum of its proper divisors (10357651).

72503501 is a wasteful number, since it uses less digits than its factorization.

72503501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10357650.

The product of its (nonzero) digits is 1050, while the sum is 23.

The square root of 72503501 is about 8514.8987662802. The cubic root of 72503501 is about 416.9842575627.

The spelling of 72503501 in words is "seventy-two million, five hundred three thousand, five hundred one".