67739921 has 8 divisors (see below), whose sum is σ = 72964320. Its totient is φ = 62681472.

The previous prime is 67739891. The next prime is 67739923. The reversal of 67739921 is 12993776.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 67739921 - 2²² = 63545617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67739923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40640 + ... + 42273.

It is an arithmetic number, because the mean of its divisors is an integer number (9120540).

Almost surely, 2^67739921 is an apocalyptic number.

It is an amenable number.

67739921 is a deficient number, since it is larger than the sum of its proper divisors (5224399).

67739921 is a wasteful number, since it uses less digits than its factorization.

67739921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82975.

The product of its digits is 142884, while the sum is 44.

The square root of 67739921 is about 8230.4265381571. The cubic root of 67739921 is about 407.6444763531.

The spelling of 67739921 in words is "sixty-seven million, seven hundred thirty-nine thousand, nine hundred twenty-one".