6381641428 has 6 divisors (see below), whose sum is σ = 11167872506. Its totient is φ = 3190820712.

The previous prime is 6381641423. The next prime is 6381641447. The reversal of 6381641428 is 8241461836.

It can be written as a sum of positive squares in only one way, i.e., 6013692304 + 367949124 = 77548^2 + 19182^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6381641423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 797705175 + ... + 797705182.

Almost surely, 2^6381641428 is an apocalyptic number.

It is an amenable number.

6381641428 is a deficient number, since it is larger than the sum of its proper divisors (4786231078).

6381641428 is a wasteful number, since it uses less digits than its factorization.

6381641428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1595410361 (or 1595410359 counting only the distinct ones).

The product of its digits is 221184, while the sum is 43.

The square root of 6381641428 is about 79885.1765223061. The cubic root of 6381641428 is about 1854.8585636236.

The spelling of 6381641428 in words is "six billion, three hundred eighty-one million, six hundred forty-one thousand, four hundred twenty-eight".