72124431 has 8 divisors (see below), whose sum is σ = 96480384. Its totient is φ = 47925720.

The previous prime is 72124417. The next prime is 72124441. The reversal of 72124431 is 13442127.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-72124431 is a prime.

It is a super-2 number, since 2×72124431² = 10403867094147522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72124441) 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, 38235 + ... + 40076.

It is an arithmetic number, because the mean of its divisors is an integer number (12060048).

Almost surely, 2^72124431 is an apocalyptic number.

72124431 is a deficient number, since it is larger than the sum of its proper divisors (24355953).

72124431 is a wasteful number, since it uses less digits than its factorization.

72124431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78621.

The product of its digits is 1344, while the sum is 24.

The square root of 72124431 is about 8492.6103760858. The cubic root of 72124431 is about 416.2562812316.

Adding to 72124431 its reverse (13442127), we get a palindrome (85566558).

It can be divided in two parts, 721 and 24431, that added together give a palindrome (25152).

The spelling of 72124431 in words is "seventy-two million, one hundred twenty-four thousand, four hundred thirty-one".