72509169 has 4 divisors (see below), whose sum is σ = 96678896. Its totient is φ = 48339444.

The previous prime is 72509167. The next prime is 72509183. The reversal of 72509169 is 96190527.

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 72509169 - 2¹ = 72509167 is a prime.

It is a super-2 number, since 2×72509169² = 10515159178141122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (72509167) 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, 12084859 + ... + 12084864.

It is an arithmetic number, because the mean of its divisors is an integer number (24169724).

Almost surely, 2^72509169 is an apocalyptic number.

It is an amenable number.

72509169 is a deficient number, since it is larger than the sum of its proper divisors (24169727).

72509169 is a wasteful number, since it uses less digits than its factorization.

72509169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24169726.

The product of its (nonzero) digits is 34020, while the sum is 39.

The square root of 72509169 is about 8515.2315881601. The cubic root of 72509169 is about 416.9951232688.

The spelling of 72509169 in words is "seventy-two million, five hundred nine thousand, one hundred sixty-nine".