7988811840 has 448 divisors, whose sum is σ = 29213982720. Its totient is φ = 2053969920.

The previous prime is 7988811823. The next prime is 7988811841. The reversal of 7988811840 is 481188897.

It is a happy number.

It is a super-2 number, since 2×7988811840² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (7988811841) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 41826145 + ... + 41826335.

Almost surely, 2^7988811840 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 7988811840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14606991360).

7988811840 is an abundant number, since it is smaller than the sum of its proper divisors (21225170880).

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

7988811840 is a wasteful number, since it uses less digits than its factorization.

7988811840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367 (or 351 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 54.

The square root of 7988811840 is about 89380.1535017702. The cubic root of 7988811840 is about 1999.0672183602.

The spelling of 7988811840 in words is "seven billion, nine hundred eighty-eight million, eight hundred eleven thousand, eight hundred forty".