72539789 has 4 divisors (see below), whose sum is σ = 82902624. Its totient is φ = 62176956.

The previous prime is 72539773. The next prime is 72539813. The reversal of 72539789 is 98793527.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72539789 - 2⁴ = 72539773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72539749) 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, 5181407 + ... + 5181420.

It is an arithmetic number, because the mean of its divisors is an integer number (20725656).

Almost surely, 2^72539789 is an apocalyptic number.

It is an amenable number.

72539789 is a deficient number, since it is larger than the sum of its proper divisors (10362835).

72539789 is a wasteful number, since it uses less digits than its factorization.

72539789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10362834.

The product of its digits is 952560, while the sum is 50.

The square root of 72539789 is about 8517.0293530080. The cubic root of 72539789 is about 417.0538128292.

The spelling of 72539789 in words is "seventy-two million, five hundred thirty-nine thousand, seven hundred eighty-nine".