72478440338 has 4 divisors (see below), whose sum is σ = 108717660510. Its totient is φ = 36239220168.

The previous prime is 72478440337. The next prime is 72478440361. The reversal of 72478440338 is 83304487427.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83304487427 = 7 ⋅11900641061.

It can be written as a sum of positive squares in only one way, i.e., 38147167969 + 34331272369 = 195313^2 + 185287^2 .

It is not an unprimeable number, because it can be changed into a prime (72478440337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18119610083 + ... + 18119610086.

Almost surely, 2^72478440338 is an apocalyptic number.

72478440338 is a deficient number, since it is larger than the sum of its proper divisors (36239220172).

72478440338 is a wasteful number, since it uses less digits than its factorization.

72478440338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36239220171.

The product of its (nonzero) digits is 3612672, while the sum is 50.

The spelling of 72478440338 in words is "seventy-two billion, four hundred seventy-eight million, four hundred forty thousand, three hundred thirty-eight".