28509030 has 128 divisors (see below), whose sum is σ = 86054400. Its totient is φ = 6652800.

The previous prime is 28509011. The next prime is 28509049. The reversal of 28509030 is 3090582.

It is an interprime number because it is at equal distance from previous prime (28509011) and next prime (28509049).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 28508985 and 28509003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 85965 + ... + 86295.

It is an arithmetic number, because the mean of its divisors is an integer number (672300).

Almost surely, 2^28509030 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28509030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43027200).

28509030 is an abundant number, since it is smaller than the sum of its proper divisors (57545370).

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

28509030 is a wasteful number, since it uses less digits than its factorization.

28509030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387 (or 381 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 28509030 is about 5339.3847960229. The cubic root of 28509030 is about 305.4879942209.

The spelling of 28509030 in words is "twenty-eight million, five hundred nine thousand, thirty".