7816 has 8 divisors (see below), whose sum is σ = 14670. Its totient is φ = 3904.

The previous prime is 7793. The next prime is 7817. The reversal of 7816 is 6187.

It can be written as a sum of positive squares in only one way, i.e., 4900 + 2916 = 70^2 + 54^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×7816² = 122179712, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (7817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 481 + ... + 496.

2⁷⁸¹⁶ is an apocalyptic number.

It is an amenable number.

7816 is a deficient number, since it is larger than the sum of its proper divisors (6854).

7816 is a wasteful number, since it uses less digits than its factorization.

7816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 983 (or 979 counting only the distinct ones).

The product of its digits is 336, while the sum is 22.

The square root of 7816 is about 88.4081444212. The cubic root of 7816 is about 19.8454758558.

It can be divided in two parts, 781 and 6, that added together give a palindrome (787).

The spelling of 7816 in words is "seven thousand, eight hundred sixteen".