72872237 has 2 divisors, whose sum is σ = 72872238. Its totient is φ = 72872236.

The previous prime is 72872213. The next prime is 72872263. The reversal of 72872237 is 73227827.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72148036 + 724201 = 8494^2 + 851^2 .

It is an emirp because it is prime and its reverse (73227827) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72872237 - 2²² = 68677933 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72872237.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72872837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36436118 + 36436119.

It is an arithmetic number, because the mean of its divisors is an integer number (36436119).

Almost surely, 2^72872237 is an apocalyptic number.

It is an amenable number.

72872237 is a deficient number, since it is larger than the sum of its proper divisors (1).

72872237 is an equidigital number, since it uses as much as digits as its factorization.

72872237 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 65856, while the sum is 38.

The square root of 72872237 is about 8536.5237069899. The cubic root of 72872237 is about 417.6899576618.

The spelling of 72872237 in words is "seventy-two million, eight hundred seventy-two thousand, two hundred thirty-seven".