72312231 has 8 divisors (see below), whose sum is σ = 96459760. Its totient is φ = 48186432.

The previous prime is 72312221. The next prime is 72312257. The reversal of 72312231 is 13221327.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 72312231 - 2¹⁸ = 72050087 is a prime.

It is a super-2 number, since 2×72312231² = 10458117504394722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72312198 and 72312207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72312221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5451 + ... + 13203.

It is an arithmetic number, because the mean of its divisors is an integer number (12057470).

Almost surely, 2^72312231 is an apocalyptic number.

72312231 is a deficient number, since it is larger than the sum of its proper divisors (24147529).

72312231 is a wasteful number, since it uses less digits than its factorization.

72312231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10865.

The product of its digits is 504, while the sum is 21.

The square root of 72312231 is about 8503.6598591430. The cubic root of 72312231 is about 416.6172554385.

Adding to 72312231 its reverse (13221327), we get a palindrome (85533558).

The spelling of 72312231 in words is "seventy-two million, three hundred twelve thousand, two hundred thirty-one".