28164128 has 24 divisors (see below), whose sum is σ = 55636560. Its totient is φ = 14034240.

The previous prime is 28164119. The next prime is 28164197. The reversal of 28164128 is 82146182.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 28164094 and 28164103.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9263 + ... + 11921.

It is an arithmetic number, because the mean of its divisors is an integer number (2318190).

Almost surely, 2^28164128 is an apocalyptic number.

It is an amenable number.

28164128 is a deficient number, since it is larger than the sum of its proper divisors (27472432).

28164128 is a wasteful number, since it uses less digits than its factorization.

28164128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3000 (or 2992 counting only the distinct ones).

The product of its digits is 6144, while the sum is 32.

The square root of 28164128 is about 5306.9885999501. The cubic root of 28164128 is about 304.2510622215.

The spelling of 28164128 in words is "twenty-eight million, one hundred sixty-four thousand, one hundred twenty-eight".