6906221928 has 24 divisors (see below), whose sum is σ = 18704351250. Its totient is φ = 2302073952.

The previous prime is 6906221921. The next prime is 6906221929. The reversal of 6906221928 is 8291226096.

6906221928 is a `hidden beast` number, since 6 + 9 + 0 + 622 + 19 + 2 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 3544773444 + 3361448484 = 59538^2 + 57978^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (6906221921) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 47959803 + ... + 47959946.

Almost surely, 2^6906221928 is an apocalyptic number.

It is an amenable number.

6906221928 is an abundant number, since it is smaller than the sum of its proper divisors (11798129322).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6906221928 is a wasteful number, since it uses less digits than its factorization.

6906221928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95919761 (or 95919754 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 6906221928 is about 83103.6817956942. The cubic root of 6906221928 is about 1904.3503205469.

The spelling of 6906221928 in words is "six billion, nine hundred six million, two hundred twenty-one thousand, nine hundred twenty-eight".