67428821 has 8 divisors (see below), whose sum is σ = 67973280. Its totient is φ = 66886992.

The previous prime is 67428811. The next prime is 67428827. The reversal of 67428821 is 12882476.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67428821 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67428827) 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, 119486 + ... + 120048.

It is an arithmetic number, because the mean of its divisors is an integer number (8496660).

Almost surely, 2^67428821 is an apocalyptic number.

It is an amenable number.

67428821 is a deficient number, since it is larger than the sum of its proper divisors (544459).

67428821 is a wasteful number, since it uses less digits than its factorization.

67428821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1315.

The product of its digits is 43008, while the sum is 38.

The square root of 67428821 is about 8211.5054040048. The cubic root of 67428821 is about 407.0194739820.

The spelling of 67428821 in words is "sixty-seven million, four hundred twenty-eight thousand, eight hundred twenty-one".