7994287638 has 96 divisors (see below), whose sum is σ = 18851687712. Its totient is φ = 2438553600.

The previous prime is 7994287603. The next prime is 7994287667. The reversal of 7994287638 is 8367824997.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3169818 + ... + 3172338.

It is an arithmetic number, because the mean of its divisors is an integer number (196371747).

Almost surely, 2^7994287638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7994287638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9425843856).

7994287638 is an abundant number, since it is smaller than the sum of its proper divisors (10857400074).

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

7994287638 is a wasteful number, since it uses less digits than its factorization.

7994287638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2830 (or 2827 counting only the distinct ones).

The product of its digits is 36578304, while the sum is 63.

The square root of 7994287638 is about 89410.7803231803. The cubic root of 7994287638 is about 1999.5238564860.

The spelling of 7994287638 in words is "seven billion, nine hundred ninety-four million, two hundred eighty-seven thousand, six hundred thirty-eight".