28500028 has 12 divisors (see below), whose sum is σ = 49935760. Its totient is φ = 14232672.

The previous prime is 28500023. The next prime is 28500029. The reversal of 28500028 is 82000582.

It is a junction number, because it is equal to n+sod(n) for n = 28499975 and 28500011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28500023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201 + ... + 7552.

Almost surely, 2^28500028 is an apocalyptic number.

It is an amenable number.

28500028 is a deficient number, since it is larger than the sum of its proper divisors (21435732).

28500028 is a wasteful number, since it uses less digits than its factorization.

28500028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8676 (or 8674 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 28500028 is about 5338.5417484553. The cubic root of 28500028 is about 305.4558372467.

The spelling of 28500028 in words is "twenty-eight million, five hundred thousand, twenty-eight".