72137287 has 2 divisors, whose sum is σ = 72137288. Its totient is φ = 72137286.

The previous prime is 72137257. The next prime is 72137311. The reversal of 72137287 is 78273127.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72137287 - 2⁷ = 72137159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72137237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36068643 + 36068644.

It is an arithmetic number, because the mean of its divisors is an integer number (36068644).

Almost surely, 2^72137287 is an apocalyptic number.

72137287 is a deficient number, since it is larger than the sum of its proper divisors (1).

72137287 is an equidigital number, since it uses as much as digits as its factorization.

72137287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32928, while the sum is 37.

The square root of 72137287 is about 8493.3672356728. The cubic root of 72137287 is about 416.2810119770.

The spelling of 72137287 in words is "seventy-two million, one hundred thirty-seven thousand, two hundred eighty-seven".