28252128 has 24 divisors (see below), whose sum is σ = 74162088. Its totient is φ = 9417344.

The previous prime is 28252117. The next prime is 28252151. The reversal of 28252128 is 82125282.

It is a tau number, because it is divible by the number of its divisors (24).

It is a junction number, because it is equal to n+sod(n) for n = 28252095 and 28252104.

It is a congruent number.

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, 147051 + ... + 147242.

It is an arithmetic number, because the mean of its divisors is an integer number (3090087).

Almost surely, 2^28252128 is an apocalyptic number.

It is an amenable number.

28252128 is an abundant number, since it is smaller than the sum of its proper divisors (45909960).

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

28252128 is a wasteful number, since it uses less digits than its factorization.

28252128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294306 (or 294298 counting only the distinct ones).

The product of its digits is 5120, while the sum is 30.

The square root of 28252128 is about 5315.2730879984. The cubic root of 28252128 is about 304.5676144942.

The spelling of 28252128 in words is "twenty-eight million, two hundred fifty-two thousand, one hundred twenty-eight".