67645987 has 2 divisors, whose sum is σ = 67645988. Its totient is φ = 67645986.

The previous prime is 67645927. The next prime is 67645997. The reversal of 67645987 is 78954676.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 67645987 - 2²³ = 59257379 is a prime.

It is not a weakly prime, because it can be changed into another prime (67645927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33822993 + 33822994.

It is an arithmetic number, because the mean of its divisors is an integer number (33822994).

Almost surely, 2^67645987 is an apocalyptic number.

67645987 is a deficient number, since it is larger than the sum of its proper divisors (1).

67645987 is an equidigital number, since it uses as much as digits as its factorization.

67645987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2540160, while the sum is 52.

The square root of 67645987 is about 8224.7180498787. The cubic root of 67645987 is about 407.4559642279.

The spelling of 67645987 in words is "sixty-seven million, six hundred forty-five thousand, nine hundred eighty-seven".