6438448890 has 64 divisors (see below), whose sum is σ = 17404444800. Its totient is φ = 1693395072.

The previous prime is 6438448873. The next prime is 6438448943. The reversal of 6438448890 is 988448346.

6438448890 is a `hidden beast` number, since 6 + 438 + 44 + 88 + 90 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 143620 + ... + 183039.

It is an arithmetic number, because the mean of its divisors is an integer number (271944450).

Almost surely, 2^6438448890 is an apocalyptic number.

6438448890 is an abundant number, since it is smaller than the sum of its proper divisors (10965995910).

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

6438448890 is a wasteful number, since it uses less digits than its factorization.

6438448890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326748 (or 326742 counting only the distinct ones).

The product of its (nonzero) digits is 5308416, while the sum is 54.

The square root of 6438448890 is about 80239.9457253057. The cubic root of 6438448890 is about 1860.3461114496.

The spelling of 6438448890 in words is "six billion, four hundred thirty-eight million, four hundred forty-eight thousand, eight hundred ninety".