67728487 has 2 divisors, whose sum is σ = 67728488. Its totient is φ = 67728486.

The previous prime is 67728473. The next prime is 67728497. The reversal of 67728487 is 78482776.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 67728487 - 2²³ = 59339879 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 67728487.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67728497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33864243 + 33864244.

It is an arithmetic number, because the mean of its divisors is an integer number (33864244).

Almost surely, 2^67728487 is an apocalyptic number.

67728487 is a deficient number, since it is larger than the sum of its proper divisors (1).

67728487 is an equidigital number, since it uses as much as digits as its factorization.

67728487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1053696, while the sum is 49.

The square root of 67728487 is about 8229.7318911372. The cubic root of 67728487 is about 407.6215392669.

The spelling of 67728487 in words is "sixty-seven million, seven hundred twenty-eight thousand, four hundred eighty-seven".