7816680 has 48 divisors (see below), whose sum is σ = 25405380. Its totient is φ = 2084352.

The previous prime is 7816673. The next prime is 7816687. The reversal of 7816680 is 866187.

It is an interprime number because it is at equal distance from previous prime (7816673) and next prime (7816687).

It can be written as a sum of positive squares in 2 ways, for example, as 7518564 + 298116 = 2742^2 + 546^2 .

It is a super-2 number, since 2×7816680² = 122200972444800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (7816687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10497 + ... + 11216.

Almost surely, 2^7816680 is an apocalyptic number.

It is an amenable number.

7816680 is an abundant number, since it is smaller than the sum of its proper divisors (17588700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7816680 is a wasteful number, since it uses less digits than its factorization.

7816680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21730 (or 21723 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 7816680 is about 2795.8326130153. The cubic root of 7816680 is about 198.4605136473.

The spelling of 7816680 in words is "seven million, eight hundred sixteen thousand, six hundred eighty".