28530428 has 12 divisors (see below), whose sum is σ = 49969920. Its totient is φ = 14253312.

The previous prime is 28530421. The next prime is 28530433. The reversal of 28530428 is 82403582.

It is a junction number, because it is equal to n+sod(n) for n = 28530394 and 28530403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28530421) 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, 4508 + ... + 8796.

It is an arithmetic number, because the mean of its divisors is an integer number (4164160).

Almost surely, 2^28530428 is an apocalyptic number.

It is an amenable number.

28530428 is a deficient number, since it is larger than the sum of its proper divisors (21439492).

28530428 is a wasteful number, since it uses less digits than its factorization.

28530428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5956 (or 5954 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 32.

The square root of 28530428 is about 5341.3882090707. The cubic root of 28530428 is about 305.5644050672.

The spelling of 28530428 in words is "twenty-eight million, five hundred thirty thousand, four hundred twenty-eight".