7821197976 has 16 divisors (see below), whose sum is σ = 19552995000. Its totient is φ = 2607065984.

The previous prime is 7821197971. The next prime is 7821197977. The reversal of 7821197976 is 6797911287.

It is a super-2 number, since 2×7821197976² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7821197971) 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, 162941601 + ... + 162941648.

Almost surely, 2^7821197976 is an apocalyptic number.

It is an amenable number.

7821197976 is an abundant number, since it is smaller than the sum of its proper divisors (11731797024).

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

7821197976 is a wasteful number, since it uses less digits than its factorization.

7821197976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325883258 (or 325883254 counting only the distinct ones).

The product of its digits is 2667168, while the sum is 57.

The square root of 7821197976 is about 88437.5371434551. The cubic root of 7821197976 is about 1984.9874245809.

The spelling of 7821197976 in words is "seven billion, eight hundred twenty-one million, one hundred ninety-seven thousand, nine hundred seventy-six".