72502009 has 4 divisors (see below), whose sum is σ = 73206016. Its totient is φ = 71798004.

The previous prime is 72502007. The next prime is 72502037. The reversal of 72502009 is 90020527.

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 not a de Polignac number, because 72502009 - 2¹ = 72502007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72502007) 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, 351849 + ... + 352054.

It is an arithmetic number, because the mean of its divisors is an integer number (18301504).

Almost surely, 2^72502009 is an apocalyptic number.

It is an amenable number.

72502009 is a deficient number, since it is larger than the sum of its proper divisors (704007).

72502009 is a wasteful number, since it uses less digits than its factorization.

72502009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704006.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 72502009 is about 8514.8111546880. The cubic root of 72502009 is about 416.9813972651.

The spelling of 72502009 in words is "seventy-two million, five hundred two thousand, nine".