6688988928 has 54 divisors (see below), whose sum is σ = 19286010744. Its totient is φ = 2229662208.

The previous prime is 6688988923. The next prime is 6688988941. The reversal of 6688988928 is 8298898866.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6688988923) 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, 1449300 + ... + 1453907.

Almost surely, 2^6688988928 is an apocalyptic number.

It is an amenable number.

6688988928 is an abundant number, since it is smaller than the sum of its proper divisors (12597021816).

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

6688988928 is a wasteful number, since it uses less digits than its factorization.

6688988928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2903229 (or 2903212 counting only the distinct ones).

The product of its digits is 191102976, while the sum is 72.

The square root of 6688988928 is about 81786.2392337489. The cubic root of 6688988928 is about 1884.1703228167.

The spelling of 6688988928 in words is "six billion, six hundred eighty-eight million, nine hundred eighty-eight thousand, nine hundred twenty-eight".