6688888930 has 16 divisors (see below), whose sum is σ = 12041067960. Its totient is φ = 2675318272.

The previous prime is 6688888883. The next prime is 6688888931. The reversal of 6688888930 is 398888866.

It can be written as a sum of positive squares in 4 ways, for example, as 3516608601 + 3172280329 = 59301^2 + 56323^2 .

It is not an unprimeable number, because it can be changed into a prime (6688888931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129276 + ... + 173464.

Almost surely, 2^6688888930 is an apocalyptic number.

6688888930 is a deficient number, since it is larger than the sum of its proper divisors (5352179030).

6688888930 is a wasteful number, since it uses less digits than its factorization.

6688888930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59333.

The product of its (nonzero) digits is 31850496, while the sum is 64.

The square root of 6688888930 is about 81785.6278939032. The cubic root of 6688888930 is about 1884.1609335451.

Subtracting from 6688888930 its sum of digits (64), we obtain a palindrome (6688888866).

The spelling of 6688888930 in words is "six billion, six hundred eighty-eight million, eight hundred eighty-eight thousand, nine hundred thirty".