72234509 has 4 divisors (see below), whose sum is σ = 73312704. Its totient is φ = 71156316.

The previous prime is 72234499. The next prime is 72234527. The reversal of 72234509 is 90543227.

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 72234509 - 2¹² = 72230413 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 (72234809) 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, 538997 + ... + 539130.

It is an arithmetic number, because the mean of its divisors is an integer number (18328176).

Almost surely, 2^72234509 is an apocalyptic number.

It is an amenable number.

72234509 is a deficient number, since it is larger than the sum of its proper divisors (1078195).

72234509 is a wasteful number, since it uses less digits than its factorization.

72234509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1078194.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 72234509 is about 8499.0887158565. The cubic root of 72234509 is about 416.4679402916.

The spelling of 72234509 in words is "seventy-two million, two hundred thirty-four thousand, five hundred nine".