7820556340 has 12 divisors (see below), whose sum is σ = 16423168356. Its totient is φ = 3128222528.

The previous prime is 7820556287. The next prime is 7820556349. The reversal of 7820556340 is 436550287.

It can be written as a sum of positive squares in 2 ways, for example, as 1122116004 + 6698440336 = 33498^2 + 81844^2 .

It is a super-2 number, since 2×7820556340² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7820556293 and 7820556302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7820556349) 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 3 ways as a sum of consecutive naturals, for example, 195513889 + ... + 195513928.

It is an arithmetic number, because the mean of its divisors is an integer number (1368597363).

Almost surely, 2^7820556340 is an apocalyptic number.

It is an amenable number.

7820556340 is an abundant number, since it is smaller than the sum of its proper divisors (8602612016).

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

7820556340 is a wasteful number, since it uses less digits than its factorization.

7820556340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391027826 (or 391027824 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 40.

The square root of 7820556340 is about 88433.9094465466. The cubic root of 7820556340 is about 1984.9331415830.

The spelling of 7820556340 in words is "seven billion, eight hundred twenty million, five hundred fifty-six thousand, three hundred forty".