67989861 has 10 divisors (see below), whose sum is σ = 101565222. Its totient is φ = 45326520.

The previous prime is 67989853. The next prime is 67989877. The reversal of 67989861 is 16898976.

It can be written as a sum of positive squares in only one way, i.e., 53012961 + 14976900 = 7281^2 + 3870^2 .

It is not a de Polignac number, because 67989861 - 2³ = 67989853 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 67989798 and 67989807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67989821) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 419610 + ... + 419771.

Almost surely, 2^67989861 is an apocalyptic number.

It is an amenable number.

67989861 is a deficient number, since it is larger than the sum of its proper divisors (33575361).

67989861 is an equidigital number, since it uses as much as digits as its factorization.

67989861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 839393 (or 839384 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 54.

The square root of 67989861 is about 8245.5964611422. The cubic root of 67989861 is about 408.1452229574.

The spelling of 67989861 in words is "sixty-seven million, nine hundred eighty-nine thousand, eight hundred sixty-one".