7688643437 has 4 divisors (see below), whose sum is σ = 7689025500. Its totient is φ = 7688261376.

The previous prime is 7688643419. The next prime is 7688643439. The reversal of 7688643437 is 7343468867.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4852654921 + 2835988516 = 69661^2 + 53254^2 .

It is a cyclic number.

It is not a de Polignac number, because 7688643437 - 2¹⁴ = 7688627053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7688643439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159062 + ... + 201687.

It is an arithmetic number, because the mean of its divisors is an integer number (1922256375).

Almost surely, 2^7688643437 is an apocalyptic number.

It is an amenable number.

7688643437 is a deficient number, since it is larger than the sum of its proper divisors (382063).

7688643437 is a wasteful number, since it uses less digits than its factorization.

7688643437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382062.

The product of its digits is 16257024, while the sum is 56.

The square root of 7688643437 is about 87684.9099731533. The cubic root of 7688643437 is about 1973.7095399090.

The spelling of 7688643437 in words is "seven billion, six hundred eighty-eight million, six hundred forty-three thousand, four hundred thirty-seven".