28128426 has 8 divisors (see below), whose sum is σ = 56256864. Its totient is φ = 9376140.

The previous prime is 28128391. The next prime is 28128449. The reversal of 28128426 is 62482182.

It is a happy number.

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

28128426 is an admirable 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, 2344030 + ... + 2344041.

It is an arithmetic number, because the mean of its divisors is an integer number (7032108).

Almost surely, 2^28128426 is an apocalyptic number.

28128426 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28128426 is a wasteful number, since it uses less digits than its factorization.

28128426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4688076.

The product of its digits is 12288, while the sum is 33.

The square root of 28128426 is about 5303.6238554407. The cubic root of 28128426 is about 304.1224474990.

The spelling of 28128426 in words is "twenty-eight million, one hundred twenty-eight thousand, four hundred twenty-six".