72706237 has 2 divisors, whose sum is σ = 72706238. Its totient is φ = 72706236.

The previous prime is 72706211. The next prime is 72706241. The reversal of 72706237 is 73260727.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70459236 + 2247001 = 8394^2 + 1499^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72706237 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72706247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36353118 + 36353119.

It is an arithmetic number, because the mean of its divisors is an integer number (36353119).

Almost surely, 2^72706237 is an apocalyptic number.

It is an amenable number.

72706237 is a deficient number, since it is larger than the sum of its proper divisors (1).

72706237 is an equidigital number, since it uses as much as digits as its factorization.

72706237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24696, while the sum is 34.

The square root of 72706237 is about 8526.7952361951. The cubic root of 72706237 is about 417.3725562701.

The spelling of 72706237 in words is "seventy-two million, seven hundred six thousand, two hundred thirty-seven".