72142831 has 4 divisors (see below), whose sum is σ = 72574992. Its totient is φ = 71710672.

The previous prime is 72142813. The next prime is 72142871. The reversal of 72142831 is 13824127.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72142831 - 2¹⁵ = 72110063 is a prime.

It is a super-2 number, since 2×72142831² = 10409176129389122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72142831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72142871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215830 + ... + 216163.

It is an arithmetic number, because the mean of its divisors is an integer number (18143748).

Almost surely, 2^72142831 is an apocalyptic number.

72142831 is a deficient number, since it is larger than the sum of its proper divisors (432161).

72142831 is a wasteful number, since it uses less digits than its factorization.

72142831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432160.

The product of its digits is 2688, while the sum is 28.

The square root of 72142831 is about 8493.6936017259. The cubic root of 72142831 is about 416.2916759157.

Adding to 72142831 its reverse (13824127), we get a palindrome (85966958).

The spelling of 72142831 in words is "seventy-two million, one hundred forty-two thousand, eight hundred thirty-one".