67921838 has 4 divisors (see below), whose sum is σ = 101882760. Its totient is φ = 33960918.

The previous prime is 67921807. The next prime is 67921849. The reversal of 67921838 is 83812976.

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

It is a super-2 number, since 2×67921838² = 9226752154596488, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 16980458 + ... + 16980461.

It is an arithmetic number, because the mean of its divisors is an integer number (25470690).

Almost surely, 2^67921838 is an apocalyptic number.

67921838 is a deficient number, since it is larger than the sum of its proper divisors (33960922).

67921838 is a wasteful number, since it uses less digits than its factorization.

67921838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33960921.

The product of its digits is 145152, while the sum is 44.

The square root of 67921838 is about 8241.4706211938. The cubic root of 67921838 is about 408.0090628193.

The spelling of 67921838 in words is "sixty-seven million, nine hundred twenty-one thousand, eight hundred thirty-eight".