72478393 has 4 divisors (see below), whose sum is σ = 78053668. Its totient is φ = 66903120.

The previous prime is 72478381. The next prime is 72478397. The reversal of 72478393 is 39387427.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39387427 = 53 ⋅743159.

It can be written as a sum of positive squares in 2 ways, for example, as 18939904 + 53538489 = 4352^2 + 7317^2 .

It is a cyclic number.

It is not a de Polignac number, because 72478393 - 2²⁵ = 38923961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72478397) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2787618 + ... + 2787643.

It is an arithmetic number, because the mean of its divisors is an integer number (19513417).

Almost surely, 2^72478393 is an apocalyptic number.

It is an amenable number.

72478393 is a deficient number, since it is larger than the sum of its proper divisors (5575275).

72478393 is a wasteful number, since it uses less digits than its factorization.

72478393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5575274.

The product of its digits is 254016, while the sum is 43.

The square root of 72478393 is about 8513.4242816860. The cubic root of 72478393 is about 416.9361180505.

The spelling of 72478393 in words is "seventy-two million, four hundred seventy-eight thousand, three hundred ninety-three".