28601928 has 48 divisors (see below), whose sum is σ = 79361100. Its totient is φ = 9300480.

The previous prime is 28601921. The next prime is 28601953. The reversal of 28601928 is 82910682.

28601928 is a `hidden beast` number, since 28 + 601 + 9 + 28 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 26811684 + 1790244 = 5178^2 + 1338^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 28601892 and 28601901.

It is not an unprimeable number, because it can be changed into a prime (28601921) 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, 1893 + ... + 7796.

Almost surely, 2^28601928 is an apocalyptic number.

It is an amenable number.

28601928 is an abundant number, since it is smaller than the sum of its proper divisors (50759172).

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

28601928 is a wasteful number, since it uses less digits than its factorization.

28601928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9742 (or 9735 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 28601928 is about 5348.0770375902. The cubic root of 28601928 is about 305.8194500714.

The spelling of 28601928 in words is "twenty-eight million, six hundred one thousand, nine hundred twenty-eight".