72847231 has 4 divisors (see below), whose sum is σ = 72955512. Its totient is φ = 72738952.

The previous prime is 72847223. The next prime is 72847249. The reversal of 72847231 is 13274827.

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 72847231 - 2³ = 72847223 is a prime.

It is a super-2 number, since 2×72847231² = 10613438128734722, 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 (72847331) 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, 53125 + ... + 54478.

It is an arithmetic number, because the mean of its divisors is an integer number (18238878).

Almost surely, 2^72847231 is an apocalyptic number.

72847231 is a deficient number, since it is larger than the sum of its proper divisors (108281).

72847231 is a wasteful number, since it uses less digits than its factorization.

72847231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108280.

The product of its digits is 18816, while the sum is 34.

The square root of 72847231 is about 8535.0589335985. The cubic root of 72847231 is about 417.6421756328.

The spelling of 72847231 in words is "seventy-two million, eight hundred forty-seven thousand, two hundred thirty-one".