67989986 has 4 divisors (see below), whose sum is σ = 101984982. Its totient is φ = 33994992.

The previous prime is 67989983. The next prime is 67989997. The reversal of 67989986 is 68998976.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 66504025 + 1485961 = 8155^2 + 1219^2 .

It is not an unprimeable number, because it can be changed into a prime (67989983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16997495 + ... + 16997498.

Almost surely, 2^67989986 is an apocalyptic number.

67989986 is a deficient number, since it is larger than the sum of its proper divisors (33994996).

67989986 is a wasteful number, since it uses less digits than its factorization.

67989986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33994995.

The product of its digits is 11757312, while the sum is 62.

The square root of 67989986 is about 8245.6040409421. The cubic root of 67989986 is about 408.1454730835.

The spelling of 67989986 in words is "sixty-seven million, nine hundred eighty-nine thousand, nine hundred eighty-six".