72561503 has 12 divisors (see below), whose sum is σ = 85601232. Its totient is φ = 61316640.

The previous prime is 72561497. The next prime is 72561521. The reversal of 72561503 is 30516527.

It is not a de Polignac number, because 72561503 - 2⁴ = 72561487 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 (72561553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6950 + ... + 13907.

It is an arithmetic number, because the mean of its divisors is an integer number (7133436).

Almost surely, 2^72561503 is an apocalyptic number.

72561503 is a deficient number, since it is larger than the sum of its proper divisors (13039729).

72561503 is a wasteful number, since it uses less digits than its factorization.

72561503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20942 (or 20935 counting only the distinct ones).

The product of its (nonzero) digits is 6300, while the sum is 29.

The square root of 72561503 is about 8518.3039978625. The cubic root of 72561503 is about 417.0954221913.

The spelling of 72561503 in words is "seventy-two million, five hundred sixty-one thousand, five hundred three".