6687919428 has 12 divisors (see below), whose sum is σ = 15605145360. Its totient is φ = 2229306472.

The previous prime is 6687919417. The next prime is 6687919463. The reversal of 6687919428 is 8249197866.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 278663298 + ... + 278663321.

It is an arithmetic number, because the mean of its divisors is an integer number (1300428780).

Almost surely, 2^6687919428 is an apocalyptic number.

It is an amenable number.

6687919428 is an abundant number, since it is smaller than the sum of its proper divisors (8917225932).

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

6687919428 is a wasteful number, since it uses less digits than its factorization.

6687919428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557326626 (or 557326624 counting only the distinct ones).

The product of its digits is 10450944, while the sum is 60.

The square root of 6687919428 is about 81779.7005863925. The cubic root of 6687919428 is about 1884.0698976957.

The spelling of 6687919428 in words is "six billion, six hundred eighty-seven million, nine hundred nineteen thousand, four hundred twenty-eight".