7789681 has 3 divisors (see below), whose sum is σ = 7792473. Its totient is φ = 7786890.

The previous prime is 7789669. The next prime is 7789687. The reversal of 7789681 is 1869877.

The square root of 7789681 is 2791.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1869877 = 23 ⋅81299.

It is a de Polignac number, because none of the positive numbers 2^k-7789681 is a prime.

It is a super-4 number, since 4×7789681⁴ (a number of 29 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

7789681 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7789687) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1396 + ... + 4186.

It is an arithmetic number, because the mean of its divisors is an integer number (2597491).

Almost surely, 2^7789681 is an apocalyptic number.

7789681 is the 2791-st square number.

7789681 is the 1396-th centered octagonal number.

It is an amenable number.

7789681 is a deficient number, since it is larger than the sum of its proper divisors (2792).

7789681 is an frugal number, since it uses more digits than its factorization.

7789681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5582 (or 2791 counting only the distinct ones).

The product of its digits is 169344, while the sum is 46.

The cubic root of 7789681 is about 198.2317542750.

It can be divided in two parts, 77896 and 81, that added together give a palindrome (77977).

The spelling of 7789681 in words is "seven million, seven hundred eighty-nine thousand, six hundred eighty-one".