7881394038 has 128 divisors (see below), whose sum is σ = 20043417600. Its totient is φ = 2012989440.

The previous prime is 7881393967. The next prime is 7881394063. The reversal of 7881394038 is 8304931887.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2445268 + ... + 2448488.

It is an arithmetic number, because the mean of its divisors is an integer number (156589200).

Almost surely, 2^7881394038 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7881394038, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10021708800).

7881394038 is an abundant number, since it is smaller than the sum of its proper divisors (12162023562).

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

7881394038 is a wasteful number, since it uses less digits than its factorization.

7881394038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3422.

The product of its (nonzero) digits is 1161216, while the sum is 51.

The square root of 7881394038 is about 88777.2157594504. The cubic root of 7881394038 is about 1990.0669184503.

The spelling of 7881394038 in words is "seven billion, eight hundred eighty-one million, three hundred ninety-four thousand, thirty-eight".