72943009 has 4 divisors (see below), whose sum is σ = 72966420. Its totient is φ = 72919600.

The previous prime is 72942983. The next prime is 72943019. The reversal of 72943009 is 90034927.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33315984 + 39627025 = 5772^2 + 6295^2 .

It is a cyclic number.

It is not a de Polignac number, because 72943009 - 2⁹ = 72942497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72943019) 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, 6154 + ... + 13555.

It is an arithmetic number, because the mean of its divisors is an integer number (18241605).

Almost surely, 2^72943009 is an apocalyptic number.

It is an amenable number.

72943009 is a deficient number, since it is larger than the sum of its proper divisors (23411).

72943009 is a wasteful number, since it uses less digits than its factorization.

72943009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23410.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 72943009 is about 8540.6679481174. The cubic root of 72943009 is about 417.8251311767.

The spelling of 72943009 in words is "seventy-two million, nine hundred forty-three thousand, nine".