6928561647 has 18 divisors (see below), whose sum is σ = 11438716328. Its totient is φ = 3958800552.

The previous prime is 6928561621. The next prime is 6928561657. The reversal of 6928561647 is 7461658296.

It is not a de Polignac number, because 6928561647 - 2⁶ = 6928561583 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6928561593 and 6928561602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6928561657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 655438 + ... + 665924.

Almost surely, 2^6928561647 is an apocalyptic number.

6928561647 is a deficient number, since it is larger than the sum of its proper divisors (4510154681).

6928561647 is an frugal number, since it uses more digits than its factorization.

6928561647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20987 (or 10497 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 54.

The square root of 6928561647 is about 83237.9819974031. The cubic root of 6928561647 is about 1906.4014594811.

The spelling of 6928561647 in words is "six billion, nine hundred twenty-eight million, five hundred sixty-one thousand, six hundred forty-seven".