7964393988 has 48 divisors (see below), whose sum is σ = 19721378880. Its totient is φ = 2492964864.

The previous prime is 7964393963. The next prime is 7964394001. The reversal of 7964393988 is 8893934697.

It is a happy number.

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, 46308 + ... + 134436.

It is an arithmetic number, because the mean of its divisors is an integer number (410862060).

Almost surely, 2^7964393988 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 7964393988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9860689440).

7964393988 is an abundant number, since it is smaller than the sum of its proper divisors (11756984892).

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

7964393988 is a wasteful number, since it uses less digits than its factorization.

7964393988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88596 (or 88594 counting only the distinct ones).

The product of its digits is 70543872, while the sum is 66.

The square root of 7964393988 is about 89243.4534741905. The cubic root of 7964393988 is about 1997.0284193743.

The spelling of 7964393988 in words is "seven billion, nine hundred sixty-four million, three hundred ninety-three thousand, nine hundred eighty-eight".