72104231 has 4 divisors (see below), whose sum is σ = 74053032. Its totient is φ = 70155432.

The previous prime is 72104209. The next prime is 72104239. The reversal of 72104231 is 13240127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13240127 = 17 ⋅778831.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72104231 is a prime.

It is a super-2 number, since 2×72104231² = 10398040256202722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72104239) 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, 974345 + ... + 974418.

It is an arithmetic number, because the mean of its divisors is an integer number (18513258).

Almost surely, 2^72104231 is an apocalyptic number.

72104231 is a deficient number, since it is larger than the sum of its proper divisors (1948801).

72104231 is a wasteful number, since it uses less digits than its factorization.

72104231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1948800.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 72104231 is about 8491.4210235979. The cubic root of 72104231 is about 416.2174170914.

Adding to 72104231 its reverse (13240127), we get a palindrome (85344358).

The spelling of 72104231 in words is "seventy-two million, one hundred four thousand, two hundred thirty-one".