6438428 has 12 divisors (see below), whose sum is σ = 11452392. Its totient is φ = 3166320.

The previous prime is 6438409. The next prime is 6438431. The reversal of 6438428 is 8248346.

It is a super-2 number, since 2×6438428² = 82906710222368, which contains 22 as substring.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12950 + ... + 13437.

It is an arithmetic number, because the mean of its divisors is an integer number (954366).

Almost surely, 2^6438428 is an apocalyptic number.

It is an amenable number.

6438428 is a deficient number, since it is larger than the sum of its proper divisors (5013964).

6438428 is a wasteful number, since it uses less digits than its factorization.

6438428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26452 (or 26450 counting only the distinct ones).

The product of its digits is 36864, while the sum is 35.

The square root of 6438428 is about 2537.4057617969. The cubic root of 6438428 is about 186.0344099439.

The spelling of 6438428 in words is "six million, four hundred thirty-eight thousand, four hundred twenty-eight".