72543389 has 4 divisors (see below), whose sum is σ = 72566556. Its totient is φ = 72520224.

The previous prime is 72543353. The next prime is 72543397. The reversal of 72543389 is 98334527.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98334527 = 461 ⋅213307.

It can be written as a sum of positive squares in 2 ways, for example, as 20775364 + 51768025 = 4558^2 + 7195^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72543389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72543319) 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, 5984 + ... + 13449.

It is an arithmetic number, because the mean of its divisors is an integer number (18141639).

Almost surely, 2^72543389 is an apocalyptic number.

It is an amenable number.

72543389 is a deficient number, since it is larger than the sum of its proper divisors (23167).

72543389 is a wasteful number, since it uses less digits than its factorization.

72543389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23166.

The product of its digits is 181440, while the sum is 41.

The square root of 72543389 is about 8517.2406916794. The cubic root of 72543389 is about 417.0607118884.

The spelling of 72543389 in words is "seventy-two million, five hundred forty-three thousand, three hundred eighty-nine".