6428638 has 8 divisors (see below), whose sum is σ = 10062288. Its totient is φ = 3074544.

The previous prime is 6428627. The next prime is 6428647. The reversal of 6428638 is 8368246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 6428597 and 6428606.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69831 + ... + 69922.

It is an arithmetic number, because the mean of its divisors is an integer number (1257786).

Almost surely, 2^6428638 is an apocalyptic number.

6428638 is a deficient number, since it is larger than the sum of its proper divisors (3633650).

6428638 is a wasteful number, since it uses less digits than its factorization.

6428638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139778.

The product of its digits is 55296, while the sum is 37.

The square root of 6428638 is about 2535.4758922143. The cubic root of 6428638 is about 185.9400701055.

The spelling of 6428638 in words is "six million, four hundred twenty-eight thousand, six hundred thirty-eight".