6642987438 has 16 divisors (see below), whose sum is σ = 13291376976. Its totient is φ = 2213428800.

The previous prime is 6642987433. The next prime is 6642987487. The reversal of 6642987438 is 8347892466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6642987433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 209013 + ... + 238688.

It is an arithmetic number, because the mean of its divisors is an integer number (830711061).

Almost surely, 2^6642987438 is an apocalyptic number.

6642987438 is an abundant number, since it is smaller than the sum of its proper divisors (6648389538).

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

6642987438 is a wasteful number, since it uses less digits than its factorization.

6642987438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450179.

The product of its digits is 13934592, while the sum is 57.

The square root of 6642987438 is about 81504.5240339455. The cubic root of 6642987438 is about 1879.8411135905.

The spelling of 6642987438 in words is "six billion, six hundred forty-two million, nine hundred eighty-seven thousand, four hundred thirty-eight".