7988840256 has 28 divisors (see below), whose sum is σ = 21137140352. Its totient is φ = 2662946688.

The previous prime is 7988840231. The next prime is 7988840257. The reversal of 7988840256 is 6520488897.

It is a super-2 number, since 2×7988840256² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7988840196 and 7988840205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7988840257) 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, 20804080 + ... + 20804463.

Almost surely, 2^7988840256 is an apocalyptic number.

It is an amenable number.

7988840256 is an abundant number, since it is smaller than the sum of its proper divisors (13148300096).

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

7988840256 is a wasteful number, since it uses less digits than its factorization.

7988840256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41608558 (or 41608548 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 57.

The square root of 7988840256 is about 89380.3124630922. The cubic root of 7988840256 is about 1999.0695885677.

The spelling of 7988840256 in words is "seven billion, nine hundred eighty-eight million, eight hundred forty thousand, two hundred fifty-six".