7822871809 has 9 divisors (see below), whose sum is σ = 7876929411. Its totient is φ = 7769184480.

The previous prime is 7822871801. The next prime is 7822871821. The reversal of 7822871809 is 9081782287.

The square root of 7822871809 is 88447.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 5883350209 + 1939521600 = 76703^2 + 44040^2 .

It is not a de Polignac number, because 7822871809 - 2³ = 7822871801 is a prime.

It is a super-2 number, since 2×7822871809² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7822871801) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 21315544 + ... + 21315910.

It is an arithmetic number, because the mean of its divisors is an integer number (875214379).

Almost surely, 2^7822871809 is an apocalyptic number.

7822871809 is the 88447-th square number.

7822871809 is the 44224-th centered octagonal number.

It is an amenable number.

7822871809 is a deficient number, since it is larger than the sum of its proper divisors (54057602).

7822871809 is an frugal number, since it uses more digits than its factorization.

7822871809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1216 (or 608 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 52.

The cubic root of 7822871809 is about 1985.1290184251.

The spelling of 7822871809 in words is "seven billion, eight hundred twenty-two million, eight hundred seventy-one thousand, eight hundred nine".