72235809 has 12 divisors (see below), whose sum is σ = 106886052. Its totient is φ = 46982400.

The previous prime is 72235799. The next prime is 72235811. The reversal of 72235809 is 90853227.

It is a happy number.

72235809 is a `hidden beast` number, since 72 + 2 + 3 + 580 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 27720225 + 44515584 = 5265^2 + 6672^2 .

It is not a de Polignac number, because 72235809 - 2¹¹ = 72233761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72235409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 97512 + ... + 98249.

It is an arithmetic number, because the mean of its divisors is an integer number (8907171).

Almost surely, 2^72235809 is an apocalyptic number.

It is an amenable number.

72235809 is a deficient number, since it is larger than the sum of its proper divisors (34650243).

72235809 is a wasteful number, since it uses less digits than its factorization.

72235809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195808 (or 195805 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 72235809 is about 8499.1651943000. The cubic root of 72235809 is about 416.4704386593.

The spelling of 72235809 in words is "seventy-two million, two hundred thirty-five thousand, eight hundred nine".