72284438 has 4 divisors (see below), whose sum is σ = 108426660. Its totient is φ = 36142218.

The previous prime is 72284431. The next prime is 72284479. The reversal of 72284438 is 83448227.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83448227 = 97 ⋅860291.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72284431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18071108 + ... + 18071111.

It is an arithmetic number, because the mean of its divisors is an integer number (27106665).

Almost surely, 2^72284438 is an apocalyptic number.

72284438 is a deficient number, since it is larger than the sum of its proper divisors (36142222).

72284438 is a wasteful number, since it uses less digits than its factorization.

72284438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36142221.

The product of its digits is 86016, while the sum is 38.

The square root of 72284438 is about 8502.0255233679. The cubic root of 72284438 is about 416.5638733804.

The spelling of 72284438 in words is "seventy-two million, two hundred eighty-four thousand, four hundred thirty-eight".