71728487 has 2 divisors, whose sum is σ = 71728488. Its totient is φ = 71728486.

The previous prime is 71728469. The next prime is 71728499. The reversal of 71728487 is 78482717.

It is a strong prime.

It is an emirp because it is prime and its reverse (78482717) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71728487 - 2⁸ = 71728231 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71728417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35864243 + 35864244.

It is an arithmetic number, because the mean of its divisors is an integer number (35864244).

Almost surely, 2^71728487 is an apocalyptic number.

71728487 is a deficient number, since it is larger than the sum of its proper divisors (1).

71728487 is an equidigital number, since it uses as much as digits as its factorization.

71728487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 175616, while the sum is 44.

The square root of 71728487 is about 8469.2672056088. The cubic root of 71728487 is about 415.4931708990.

The spelling of 71728487 in words is "seventy-one million, seven hundred twenty-eight thousand, four hundred eighty-seven".