7730 has 8 divisors (see below), whose sum is σ = 13932. Its totient is φ = 3088.

The previous prime is 7727. The next prime is 7741. The reversal of 7730 is 377.

It can be written as a sum of positive squares in 2 ways, for example, as 6889 + 841 = 83^2 + 29^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is a Curzon number.

It is a plaindrome in base 15.

It is a nialpdrome in base 6 and base 10.

It is a junction number, because it is equal to n+sod(n) for n = 7699 and 7708.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 377 + ... + 396.

2⁷⁷³⁰ is an apocalyptic number.

7730 is a deficient number, since it is larger than the sum of its proper divisors (6202).

7730 is a wasteful number, since it uses less digits than its factorization.

7730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780.

The product of its (nonzero) digits is 147, while the sum is 17.

The square root of 7730 is about 87.9204185613. The cubic root of 7730 is about 19.7724201940.

It can be divided in two parts, 7 and 730, that added together give a palindrome (737).

The spelling of 7730 in words is "seven thousand, seven hundred thirty".