8381428724 has 12 divisors (see below), whose sum is σ = 14685591648. Its totient is φ = 4185545400.

The previous prime is 8381428711. The next prime is 8381428729. The reversal of 8381428724 is 4278241838.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8381428729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1288592 + ... + 1295079.

It is an arithmetic number, because the mean of its divisors is an integer number (1223799304).

Almost surely, 2^8381428724 is an apocalyptic number.

It is an amenable number.

8381428724 is a deficient number, since it is larger than the sum of its proper divisors (6304162924).

8381428724 is a wasteful number, since it uses less digits than its factorization.

8381428724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2584486 (or 2584484 counting only the distinct ones).

The product of its digits is 688128, while the sum is 47.

The square root of 8381428724 is about 91550.1432221709. The cubic root of 8381428724 is about 2031.2935306944.

The spelling of 8381428724 in words is "eight billion, three hundred eighty-one million, four hundred twenty-eight thousand, seven hundred twenty-four".