7681996609 has 27 divisors (see below), whose sum is σ = 9445613697. Its totient is φ = 6228546408.

The previous prime is 7681996603. The next prime is 7681996613. The reversal of 7681996609 is 9066991867.

The square root of 7681996609 is 87647.

It is a perfect power (a square), and thus also a powerful number.

7681996609 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 7681996609 - 2¹³ = 7681988417 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7681996603) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 11656722 + ... + 11657380.

Almost surely, 2^7681996609 is an apocalyptic number.

7681996609 is the 87647-th square number.

7681996609 is the 43824-th centered octagonal number.

It is an amenable number.

7681996609 is a deficient number, since it is larger than the sum of its proper divisors (1763617088).

7681996609 is an frugal number, since it uses more digits than its factorization.

7681996609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1370 (or 685 counting only the distinct ones).

The product of its (nonzero) digits is 8817984, while the sum is 61.

The cubic root of 7681996609 is about 1973.1406189982.

The spelling of 7681996609 in words is "seven billion, six hundred eighty-one million, nine hundred ninety-six thousand, six hundred nine".