6728412921 has 8 divisors (see below), whose sum is σ = 9021336480. Its totient is φ = 4460548992.

The previous prime is 6728412907. The next prime is 6728412937. The reversal of 6728412921 is 1292148276.

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

It is not a de Polignac number, because 6728412921 - 2¹¹ = 6728410873 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6728412991) 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, 6264280 + ... + 6265353.

It is an arithmetic number, because the mean of its divisors is an integer number (1127667060).

Almost surely, 2^6728412921 is an apocalyptic number.

It is an amenable number.

6728412921 is a deficient number, since it is larger than the sum of its proper divisors (2292923559).

6728412921 is a wasteful number, since it uses less digits than its factorization.

6728412921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12529815.

The product of its digits is 96768, while the sum is 42.

The square root of 6728412921 is about 82026.9036414273. The cubic root of 6728412921 is about 1887.8647555294.

The spelling of 6728412921 in words is "six billion, seven hundred twenty-eight million, four hundred twelve thousand, nine hundred twenty-one".