6439638654 has 24 divisors (see below), whose sum is σ = 13985866440. Its totient is φ = 2141420688.

The previous prime is 6439638643. The next prime is 6439638659. The reversal of 6439638654 is 4568369346.

It is a self number, because there is not a number n which added to its sum of digits gives 6439638654.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6439638659) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 419377 + ... + 434460.

It is an arithmetic number, because the mean of its divisors is an integer number (582744435).

Almost surely, 2^6439638654 is an apocalyptic number.

6439638654 is an abundant number, since it is smaller than the sum of its proper divisors (7546227786).

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

6439638654 is a wasteful number, since it uses less digits than its factorization.

6439638654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 854264 (or 854261 counting only the distinct ones).

The product of its digits is 11197440, while the sum is 54.

The square root of 6439638654 is about 80247.3591715017. The cubic root of 6439638654 is about 1860.4606958029.

The spelling of 6439638654 in words is "six billion, four hundred thirty-nine million, six hundred thirty-eight thousand, six hundred fifty-four".