67979851 has 4 divisors (see below), whose sum is σ = 68014512. Its totient is φ = 67945192.

The previous prime is 67979839. The next prime is 67979887. The reversal of 67979851 is 15897976.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 67979851 - 2²¹ = 65882699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67979251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14200 + ... + 18373.

It is an arithmetic number, because the mean of its divisors is an integer number (17003628).

Almost surely, 2^67979851 is an apocalyptic number.

67979851 is a deficient number, since it is larger than the sum of its proper divisors (34661).

67979851 is a wasteful number, since it uses less digits than its factorization.

67979851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34660.

The product of its digits is 952560, while the sum is 52.

The square root of 67979851 is about 8244.9894481436. The cubic root of 67979851 is about 408.1251918619.

The spelling of 67979851 in words is "sixty-seven million, nine hundred seventy-nine thousand, eight hundred fifty-one".