67789989 has 6 divisors (see below), whose sum is σ = 97918886. Its totient is φ = 45193320.

The previous prime is 67789951. The next prime is 67789991. The reversal of 67789989 is 98998776.

It can be written as a sum of positive squares in only one way, i.e., 55130625 + 12659364 = 7425^2 + 3558^2 .

It is not a de Polignac number, because 67789989 - 2⁷ = 67789861 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67789949) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3766102 + ... + 3766119.

Almost surely, 2^67789989 is an apocalyptic number.

It is an amenable number.

67789989 is a deficient number, since it is larger than the sum of its proper divisors (30128897).

67789989 is a wasteful number, since it uses less digits than its factorization.

67789989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7532227 (or 7532224 counting only the distinct ones).

The product of its digits is 13716864, while the sum is 63.

The square root of 67789989 is about 8233.4676169886. The cubic root of 67789989 is about 407.7448844873.

The spelling of 67789989 in words is "sixty-seven million, seven hundred eighty-nine thousand, nine hundred eighty-nine".