72160009 has 4 divisors (see below), whose sum is σ = 73383120. Its totient is φ = 70936900.

The previous prime is 72159973. The next prime is 72160021. The reversal of 72160009 is 90006127.

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 72160009 - 2²¹ = 70062857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72160409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 611467 + ... + 611584.

It is an arithmetic number, because the mean of its divisors is an integer number (18345780).

Almost surely, 2^72160009 is an apocalyptic number.

It is an amenable number.

72160009 is a deficient number, since it is larger than the sum of its proper divisors (1223111).

72160009 is a wasteful number, since it uses less digits than its factorization.

72160009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1223110.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 72160009 is about 8494.7047623799. The cubic root of 72160009 is about 416.3247144995.

The spelling of 72160009 in words is "seventy-two million, one hundred sixty thousand, nine".