6487638 has 16 divisors (see below), whose sum is σ = 13140480. Its totient is φ = 2135016.

The previous prime is 6487577. The next prime is 6487643. The reversal of 6487638 is 8367846.

It is a self number, because there is not a number n which added to its sum of digits gives 6487638.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6370 + ... + 7317.

It is an arithmetic number, because the mean of its divisors is an integer number (821280).

Almost surely, 2^6487638 is an apocalyptic number.

6487638 is an abundant number, since it is smaller than the sum of its proper divisors (6652842).

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

6487638 is a wasteful number, since it uses less digits than its factorization.

6487638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13771.

The product of its digits is 193536, while the sum is 42.

The square root of 6487638 is about 2547.0842153333. The cubic root of 6487638 is about 186.5071717253.

The spelling of 6487638 in words is "six million, four hundred eighty-seven thousand, six hundred thirty-eight".