67921870 has 8 divisors (see below), whose sum is σ = 122259384. Its totient is φ = 27168744.

The previous prime is 67921859. The next prime is 67921873. The reversal of 67921870 is 7812976.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×67921870² = 9226760848593800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67921873) 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, 3396084 + ... + 3396103.

It is an arithmetic number, because the mean of its divisors is an integer number (15282423).

Almost surely, 2^67921870 is an apocalyptic number.

67921870 is a deficient number, since it is larger than the sum of its proper divisors (54337514).

67921870 is a wasteful number, since it uses less digits than its factorization.

67921870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6792194.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 67921870 is about 8241.4725625946. The cubic root of 67921870 is about 408.0091268944.

The spelling of 67921870 in words is "sixty-seven million, nine hundred twenty-one thousand, eight hundred seventy".