7681812 has 12 divisors (see below), whose sum is σ = 17924256. Its totient is φ = 2560600.

The previous prime is 7681811. The next prime is 7681813. The reversal of 7681812 is 2181867.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (7681811) and next prime (7681813).

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7681811) 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, 320064 + ... + 320087.

It is an arithmetic number, because the mean of its divisors is an integer number (1493688).

Almost surely, 2^7681812 is an apocalyptic number.

It is an amenable number.

7681812 is an abundant number, since it is smaller than the sum of its proper divisors (10242444).

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

7681812 is a wasteful number, since it uses less digits than its factorization.

7681812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640158 (or 640156 counting only the distinct ones).

The product of its digits is 5376, while the sum is 33.

The square root of 7681812 is about 2771.6081974190. The cubic root of 7681812 is about 197.3124813106.

Subtracting from 7681812 its reverse (2181867), we obtain a palindrome (5499945).

The spelling of 7681812 in words is "seven million, six hundred eighty-one thousand, eight hundred twelve".