72438609 has 8 divisors (see below), whose sum is σ = 98640000. Its totient is φ = 47264816.

The previous prime is 72438593. The next prime is 72438623. The reversal of 72438609 is 90683427.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72438609 - 2⁴ = 72438593 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (72438689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256734 + ... + 257015.

It is an arithmetic number, because the mean of its divisors is an integer number (12330000).

Almost surely, 2^72438609 is an apocalyptic number.

It is an amenable number.

72438609 is a deficient number, since it is larger than the sum of its proper divisors (26201391).

72438609 is a wasteful number, since it uses less digits than its factorization.

72438609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513799.

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 72438609 is about 8511.0874158359. The cubic root of 72438609 is about 416.8598175065.

The spelling of 72438609 in words is "seventy-two million, four hundred thirty-eight thousand, six hundred nine".