7981459536 has 80 divisors (see below), whose sum is σ = 21275138304. Its totient is φ = 2576965632.

The previous prime is 7981459501. The next prime is 7981459537. The reversal of 7981459536 is 6359541897.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7981459537) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 200596 + ... + 237068.

Almost surely, 2^7981459536 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 7981459536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10637569152).

7981459536 is an abundant number, since it is smaller than the sum of its proper divisors (13293678768).

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

7981459536 is a wasteful number, since it uses less digits than its factorization.

7981459536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36628 (or 36622 counting only the distinct ones).

The product of its digits is 8164800, while the sum is 57.

The square root of 7981459536 is about 89339.0146352645. The cubic root of 7981459536 is about 1998.4537662220.

The spelling of 7981459536 in words is "seven billion, nine hundred eighty-one million, four hundred fifty-nine thousand, five hundred thirty-six".