7685128343 has 4 divisors (see below), whose sum is σ = 7848641760. Its totient is φ = 7521614928.

The previous prime is 7685128331. The next prime is 7685128349. The reversal of 7685128343 is 3438215867.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3438215867 = 6481 ⋅530507.

It is a cyclic number.

It is not a de Polignac number, because 7685128343 - 2³⁰ = 6611386519 is a prime.

It is a super-2 number, since 2×7685128343² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (47), and also a Moran number because the ratio is a prime number: 163513369 = 7685128343 / (7 + 6 + 8 + 5 + 1 + 2 + 8 + 3 + 4 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7685128349) 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, 81756638 + ... + 81756731.

It is an arithmetic number, because the mean of its divisors is an integer number (1962160440).

Almost surely, 2^7685128343 is an apocalyptic number.

7685128343 is a deficient number, since it is larger than the sum of its proper divisors (163513417).

7685128343 is a wasteful number, since it uses less digits than its factorization.

7685128343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163513416.

The product of its digits is 967680, while the sum is 47.

The square root of 7685128343 is about 87664.8637881791. The cubic root of 7685128343 is about 1973.4087138852.

The spelling of 7685128343 in words is "seven billion, six hundred eighty-five million, one hundred twenty-eight thousand, three hundred forty-three".