7987481856 has 216 divisors, whose sum is σ = 24213469280. Its totient is φ = 2529128448.

The previous prime is 7987481833. The next prime is 7987481863. The reversal of 7987481856 is 6581847897.

7987481856 is a `hidden beast` number, since 79 + 8 + 7 + 481 + 85 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 7987481793 and 7987481802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3664575 + ... + 3666753.

Almost surely, 2^7987481856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7987481856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12106734640).

7987481856 is an abundant number, since it is smaller than the sum of its proper divisors (16225987424).

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

7987481856 is a wasteful number, since it uses less digits than its factorization.

7987481856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2281 (or 2264 counting only the distinct ones).

The product of its digits is 27095040, while the sum is 63.

The square root of 7987481856 is about 89372.7131511626. The cubic root of 7987481856 is about 1998.9562767490.

The spelling of 7987481856 in words is "seven billion, nine hundred eighty-seven million, four hundred eighty-one thousand, eight hundred fifty-six".