67989931 has 4 divisors (see below), whose sum is σ = 69648264. Its totient is φ = 66331600.

The previous prime is 67989907. The next prime is 67989959. The reversal of 67989931 is 13998976.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67989931 is a prime.

It is a super-2 number, since 2×67989931² = 9245261434769522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67989631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 829105 + ... + 829186.

It is an arithmetic number, because the mean of its divisors is an integer number (17412066).

Almost surely, 2^67989931 is an apocalyptic number.

67989931 is a deficient number, since it is larger than the sum of its proper divisors (1658333).

67989931 is a wasteful number, since it uses less digits than its factorization.

67989931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1658332.

The product of its digits is 734832, while the sum is 52.

The square root of 67989931 is about 8245.6007058310. The cubic root of 67989931 is about 408.1453630281.

The spelling of 67989931 in words is "sixty-seven million, nine hundred eighty-nine thousand, nine hundred thirty-one".