67680821 has 8 divisors (see below), whose sum is σ = 73914624. Its totient is φ = 61593840.

The previous prime is 67680803. The next prime is 67680827. The reversal of 67680821 is 12808676.

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 67680821 - 2¹⁸ = 67418677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67680827) 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 7 ways as a sum of consecutive naturals, for example, 35741 + ... + 37586.

It is an arithmetic number, because the mean of its divisors is an integer number (9239328).

Almost surely, 2^67680821 is an apocalyptic number.

It is an amenable number.

67680821 is a deficient number, since it is larger than the sum of its proper divisors (6233803).

67680821 is a wasteful number, since it uses less digits than its factorization.

67680821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73411.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 67680821 is about 8226.8354183124. The cubic root of 67680821 is about 407.5258914383.

The spelling of 67680821 in words is "sixty-seven million, six hundred eighty thousand, eight hundred twenty-one".