67727521 has 2 divisors, whose sum is σ = 67727522. Its totient is φ = 67727520.

The previous prime is 67727519. The next prime is 67727549. The reversal of 67727521 is 12572776.

67727521 = T₆₇₁₈ + T₆₇₁₉ + T₆₇₂₀.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53582400 + 14145121 = 7320^2 + 3761^2 .

It is a cyclic number.

It is not a de Polignac number, because 67727521 - 2¹ = 67727519 is a prime.

Together with 67727519, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (67727551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33863760 + 33863761.

It is an arithmetic number, because the mean of its divisors is an integer number (33863761).

Almost surely, 2^67727521 is an apocalyptic number.

67727521 is the 6720-th centered triangular number.

It is an amenable number.

67727521 is a deficient number, since it is larger than the sum of its proper divisors (1).

67727521 is an equidigital number, since it uses as much as digits as its factorization.

67727521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41160, while the sum is 37.

The square root of 67727521 is about 8229.6732012881. The cubic root of 67727521 is about 407.6196013119.

The spelling of 67727521 in words is "sixty-seven million, seven hundred twenty-seven thousand, five hundred twenty-one".