6904078221 has 16 divisors (see below), whose sum is σ = 9258649920. Its totient is φ = 4576172160.

The previous prime is 6904078219. The next prime is 6904078253. The reversal of 6904078221 is 1228704096.

It is not a de Polignac number, because 6904078221 - 2¹ = 6904078219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6904078221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6904078261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 488626 + ... + 502556.

It is an arithmetic number, because the mean of its divisors is an integer number (578665620).

Almost surely, 2^6904078221 is an apocalyptic number.

It is an amenable number.

6904078221 is a deficient number, since it is larger than the sum of its proper divisors (2354571699).

6904078221 is a wasteful number, since it uses less digits than its factorization.

6904078221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14876.

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 6904078221 is about 83090.7830087068. The cubic root of 6904078221 is about 1904.1532619322.

The spelling of 6904078221 in words is "six billion, nine hundred four million, seventy-eight thousand, two hundred twenty-one".