6921953728 has 14 divisors (see below), whose sum is σ = 13735752056. Its totient is φ = 3460976832.

The previous prime is 6921953723. The next prime is 6921953741. The reversal of 6921953728 is 8273591296.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6921953723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54077700 + ... + 54077827.

Almost surely, 2^6921953728 is an apocalyptic number.

It is an amenable number.

6921953728 is a deficient number, since it is larger than the sum of its proper divisors (6813798328).

6921953728 is a wasteful number, since it uses less digits than its factorization.

6921953728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108155539 (or 108155529 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 52.

The square root of 6921953728 is about 83198.2795975974. The cubic root of 6921953728 is about 1905.7952079493.

The spelling of 6921953728 in words is "six billion, nine hundred twenty-one million, nine hundred fifty-three thousand, seven hundred twenty-eight".