7688309906 has 4 divisors (see below), whose sum is σ = 11532464862. Its totient is φ = 3844154952.

The previous prime is 7688309899. The next prime is 7688309917. The reversal of 7688309906 is 6099038867.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6099038867 = 2141 ⋅2848687.

It can be written as a sum of positive squares in only one way, i.e., 4507913881 + 3180396025 = 67141^2 + 56395^2 .

It is a super-2 number, since 2×7688309906² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

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, 1922077475 + ... + 1922077478.

Almost surely, 2^7688309906 is an apocalyptic number.

7688309906 is a deficient number, since it is larger than the sum of its proper divisors (3844154956).

7688309906 is a wasteful number, since it uses less digits than its factorization.

7688309906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3844154955.

The product of its (nonzero) digits is 3919104, while the sum is 56.

The square root of 7688309906 is about 87683.0080802432. The cubic root of 7688309906 is about 1973.6809998576.

The spelling of 7688309906 in words is "seven billion, six hundred eighty-eight million, three hundred nine thousand, nine hundred six".