6481432638 has 24 divisors (see below), whose sum is σ = 14074398000. Its totient is φ = 2155663104.

The previous prime is 6481432619. The next prime is 6481432649. The reversal of 6481432638 is 8362341846.

6481432638 is a `hidden beast` number, since 6 + 4 + 8 + 1 + 4 + 3 + 2 + 638 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 6481432593 and 6481432602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 392898 + ... + 409061.

It is an arithmetic number, because the mean of its divisors is an integer number (586433250).

Almost surely, 2^6481432638 is an apocalyptic number.

6481432638 is an abundant number, since it is smaller than the sum of its proper divisors (7592965362).

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

6481432638 is a wasteful number, since it uses less digits than its factorization.

6481432638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802416 (or 802413 counting only the distinct ones).

The product of its digits is 663552, while the sum is 45.

The square root of 6481432638 is about 80507.3452425305. The cubic root of 6481432638 is about 1864.4768866385.

The spelling of 6481432638 in words is "six billion, four hundred eighty-one million, four hundred thirty-two thousand, six hundred thirty-eight".