72543399 has 4 divisors (see below), whose sum is σ = 96724536. Its totient is φ = 48362264.

The previous prime is 72543397. The next prime is 72543407. The reversal of 72543399 is 99334527.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72543399 - 2¹ = 72543397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72543399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72543397) 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, 12090564 + ... + 12090569.

It is an arithmetic number, because the mean of its divisors is an integer number (24181134).

Almost surely, 2^72543399 is an apocalyptic number.

72543399 is a deficient number, since it is larger than the sum of its proper divisors (24181137).

72543399 is a wasteful number, since it uses less digits than its factorization.

72543399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24181136.

The product of its digits is 204120, while the sum is 42.

The square root of 72543399 is about 8517.2412787240. The cubic root of 72543399 is about 417.0607310521.

The spelling of 72543399 in words is "seventy-two million, five hundred forty-three thousand, three hundred ninety-nine".