72438865 has 8 divisors (see below), whose sum is σ = 86972328. Its totient is φ = 57920640.

The previous prime is 72438857. The next prime is 72438869. The reversal of 72438865 is 56883427.

72438865 is nontrivially palindromic in base 2 and base 4.

It can be written as a sum of positive squares in 4 ways, for example, as 11614464 + 60824401 = 3408^2 + 7799^2 .

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

It is not a de Polignac number, because 72438865 - 2³ = 72438857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72438869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16725 + ... + 20605.

It is an arithmetic number, because the mean of its divisors is an integer number (10871541).

Almost surely, 2^72438865 is an apocalyptic number.

It is an amenable number.

72438865 is a deficient number, since it is larger than the sum of its proper divisors (14533463).

72438865 is a wasteful number, since it uses less digits than its factorization.

72438865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7619.

The product of its digits is 322560, while the sum is 43.

The square root of 72438865 is about 8511.1024550290. The cubic root of 72438865 is about 416.8603085706.

The spelling of 72438865 in words is "seventy-two million, four hundred thirty-eight thousand, eight hundred sixty-five".