7985663388 has 108 divisors (see below), whose sum is σ = 21249188688. Its totient is φ = 2528380800.

The previous prime is 7985663383. The next prime is 7985663407. The reversal of 7985663388 is 8833665897.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7985663381) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2874256 + ... + 2877032.

Almost surely, 2^7985663388 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 7985663388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10624594344).

7985663388 is an abundant number, since it is smaller than the sum of its proper divisors (13263525300).

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

7985663388 is a wasteful number, since it uses less digits than its factorization.

7985663388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2984 (or 2956 counting only the distinct ones).

The product of its digits is 52254720, while the sum is 63.

The square root of 7985663388 is about 89362.5390641962. The cubic root of 7985663388 is about 1998.8045679468.

The spelling of 7985663388 in words is "seven billion, nine hundred eighty-five million, six hundred sixty-three thousand, three hundred eighty-eight".