28312128 has 168 divisors, whose sum is σ = 92456000. Its totient is φ = 8211456.

The previous prime is 28312127. The next prime is 28312129. The reversal of 28312128 is 82121382.

It is an interprime number because it is at equal distance from previous prime (28312127) and next prime (28312129).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28312127) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 142173 + ... + 142371.

Almost surely, 2^28312128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28312128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46228000).

28312128 is an abundant number, since it is smaller than the sum of its proper divisors (64143872).

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

28312128 is a wasteful number, since it uses less digits than its factorization.

28312128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249 (or 236 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 28312128 is about 5320.9142071640. The cubic root of 28312128 is about 304.7830688923.

The spelling of 28312128 in words is "twenty-eight million, three hundred twelve thousand, one hundred twenty-eight".