67421987 has 2 divisors, whose sum is σ = 67421988. Its totient is φ = 67421986.

The previous prime is 67421933. The next prime is 67422037. The reversal of 67421987 is 78912476.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 67421987 - 2¹² = 67417891 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (67421087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33710993 + 33710994.

It is an arithmetic number, because the mean of its divisors is an integer number (33710994).

Almost surely, 2^67421987 is an apocalyptic number.

67421987 is a deficient number, since it is larger than the sum of its proper divisors (1).

67421987 is an equidigital number, since it uses as much as digits as its factorization.

67421987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 169344, while the sum is 44.

The square root of 67421987 is about 8211.0892700055. The cubic root of 67421987 is about 407.0057228638.

The spelling of 67421987 in words is "sixty-seven million, four hundred twenty-one thousand, nine hundred eighty-seven".