72578237 has 2 divisors, whose sum is σ = 72578238. Its totient is φ = 72578236.

The previous prime is 72578221. The next prime is 72578239. The reversal of 72578237 is 73287527.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70744921 + 1833316 = 8411^2 + 1354^2 .

It is a cyclic number.

It is not a de Polignac number, because 72578237 - 2⁴ = 72578221 is a prime.

Together with 72578239, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 72578194 and 72578203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72578239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36289118 + 36289119.

It is an arithmetic number, because the mean of its divisors is an integer number (36289119).

Almost surely, 2^72578237 is an apocalyptic number.

It is an amenable number.

72578237 is a deficient number, since it is larger than the sum of its proper divisors (1).

72578237 is an equidigital number, since it uses as much as digits as its factorization.

72578237 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 164640, while the sum is 41.

The square root of 72578237 is about 8519.2861790176. The cubic root of 72578237 is about 417.1274829859.

The spelling of 72578237 in words is "seventy-two million, five hundred seventy-eight thousand, two hundred thirty-seven".