7821564956 has 12 divisors (see below), whose sum is σ = 13688357760. Its totient is φ = 3910605600.

The previous prime is 7821564953. The next prime is 7821564979. The reversal of 7821564956 is 6594651287.

It is a super-2 number, since 2×7821564956² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7821564898 and 7821564907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7821564953) 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, 154181 + ... + 198531.

It is an arithmetic number, because the mean of its divisors is an integer number (1140696480).

Almost surely, 2^7821564956 is an apocalyptic number.

It is an amenable number.

7821564956 is a deficient number, since it is larger than the sum of its proper divisors (5866792804).

7821564956 is a wasteful number, since it uses less digits than its factorization.

7821564956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88444 (or 88442 counting only the distinct ones).

The product of its digits is 3628800, while the sum is 53.

The square root of 7821564956 is about 88439.6119168328. The cubic root of 7821564956 is about 1985.0184700932.

The spelling of 7821564956 in words is "seven billion, eight hundred twenty-one million, five hundred sixty-four thousand, nine hundred fifty-six".