81724327 has 2 divisors, whose sum is σ = 81724328. Its totient is φ = 81724326.

The previous prime is 81724319. The next prime is 81724351. The reversal of 81724327 is 72342718.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81724327 - 2³ = 81724319 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81724292 and 81724301.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81724367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40862163 + 40862164.

It is an arithmetic number, because the mean of its divisors is an integer number (40862164).

Almost surely, 2^81724327 is an apocalyptic number.

81724327 is a deficient number, since it is larger than the sum of its proper divisors (1).

81724327 is an equidigital number, since it uses as much as digits as its factorization.

81724327 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18816, while the sum is 34.

The square root of 81724327 is about 9040.1508283878. The cubic root of 81724327 is about 433.9607498464.

The spelling of 81724327 in words is "eighty-one million, seven hundred twenty-four thousand, three hundred twenty-seven".