72471231 has 24 divisors (see below), whose sum is σ = 122557344. Its totient is φ = 40400640.

The previous prime is 72471199. The next prime is 72471241. The reversal of 72471231 is 13217427.

It is a happy number.

It is not a de Polignac number, because 72471231 - 2⁵ = 72471199 is a prime.

It is a super-2 number, since 2×72471231² = 10504158645310722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 72471195 and 72471204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72471241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11446 + ... + 16611.

It is an arithmetic number, because the mean of its divisors is an integer number (5106556).

Almost surely, 2^72471231 is an apocalyptic number.

72471231 is a deficient number, since it is larger than the sum of its proper divisors (50086113).

72471231 is a wasteful number, since it uses less digits than its factorization.

72471231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28111 (or 28108 counting only the distinct ones).

The product of its digits is 2352, while the sum is 27.

The square root of 72471231 is about 8513.0036414887. The cubic root of 72471231 is about 416.9223843260.

Adding to 72471231 its reverse (13217427), we get a palindrome (85688658).

The spelling of 72471231 in words is "seventy-two million, four hundred seventy-one thousand, two hundred thirty-one".