7988840240 has 80 divisors (see below), whose sum is σ = 19627315200. Its totient is φ = 3017853696.

The previous prime is 7988840231. The next prime is 7988840257. The reversal of 7988840240 is 420488897.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117881 + ... + 172839.

It is an arithmetic number, because the mean of its divisors is an integer number (245341440).

Almost surely, 2^7988840240 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 7988840240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9813657600).

7988840240 is an abundant number, since it is smaller than the sum of its proper divisors (11638474960).

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

7988840240 is a wasteful number, since it uses less digits than its factorization.

7988840240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55074 (or 55068 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 50.

The square root of 7988840240 is about 89380.3123735871. The cubic root of 7988840240 is about 1999.0695872332.

The spelling of 7988840240 in words is "seven billion, nine hundred eighty-eight million, eight hundred forty thousand, two hundred forty".