7813780 has 48 divisors (see below), whose sum is σ = 18126864. Its totient is φ = 2810880.

The previous prime is 7813777. The next prime is 7813781. The reversal of 7813780 is 873187.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 404496 + 7409284 = 636^2 + 2722^2 .

It is a sliding number, since 7813780 = 1280 + 7812500 and 1/1280 + 1/7812500 = 0.0007813780.

It is a super-2 number, since 2×7813780² = 122110315776800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7813781) 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 15 ways as a sum of consecutive naturals, for example, 10294 + ... + 11026.

It is an arithmetic number, because the mean of its divisors is an integer number (377643).

Almost surely, 2^7813780 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7813780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9063432).

7813780 is an abundant number, since it is smaller than the sum of its proper divisors (10313084).

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

7813780 is a wasteful number, since it uses less digits than its factorization.

7813780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 796 (or 794 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 34.

The square root of 7813780 is about 2795.3139358577. The cubic root of 7813780 is about 198.4359675621.

The spelling of 7813780 in words is "seven million, eight hundred thirteen thousand, seven hundred eighty".