72293009 has 4 divisors (see below), whose sum is σ = 73105380. Its totient is φ = 71480640.

The previous prime is 72292999. The next prime is 72293017. The reversal of 72293009 is 90039227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90039227 = 23 ⋅3914749.

It can be written as a sum of positive squares in 2 ways, for example, as 35046400 + 37246609 = 5920^2 + 6103^2 .

It is a cyclic number.

It is not a de Polignac number, because 72293009 - 2²⁴ = 55515793 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (72293059) 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, 406052 + ... + 406229.

It is an arithmetic number, because the mean of its divisors is an integer number (18276345).

Almost surely, 2^72293009 is an apocalyptic number.

It is an amenable number.

72293009 is a deficient number, since it is larger than the sum of its proper divisors (812371).

72293009 is an equidigital number, since it uses as much as digits as its factorization.

72293009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812370.

The product of its (nonzero) digits is 6804, while the sum is 32.

The square root of 72293009 is about 8502.5295647825. The cubic root of 72293009 is about 416.5803371723.

The spelling of 72293009 in words is "seventy-two million, two hundred ninety-three thousand, nine".