28232028 has 36 divisors (see below), whose sum is σ = 77853048. Its totient is φ = 8555040.

The previous prime is 28232021. The next prime is 28232047. The reversal of 28232028 is 82023282.

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 28231992 and 28232010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28232021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35251 + ... + 36042.

Almost surely, 2^28232028 is an apocalyptic number.

It is an amenable number.

28232028 is an abundant number, since it is smaller than the sum of its proper divisors (49621020).

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

28232028 is a wasteful number, since it uses less digits than its factorization.

28232028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71314 (or 71309 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 28232028 is about 5313.3819738468. The cubic root of 28232028 is about 304.4953690641.

It can be divided in two parts, 2823 and 2028, that added together give a triangular number (4851 = T₉₈).

The spelling of 28232028 in words is "twenty-eight million, two hundred thirty-two thousand, twenty-eight".