28201530 has 32 divisors (see below), whose sum is σ = 77353344. Its totient is φ = 6446016.

The previous prime is 28201517. The next prime is 28201553. The reversal of 28201530 is 3510282.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 28201497 and 28201506.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66937 + ... + 67356.

It is an arithmetic number, because the mean of its divisors is an integer number (2417292).

Almost surely, 2^28201530 is an apocalyptic number.

28201530 is an abundant number, since it is smaller than the sum of its proper divisors (49151814).

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

28201530 is a wasteful number, since it uses less digits than its factorization.

28201530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134310.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 28201530 is about 5310.5112748209. The cubic root of 28201530 is about 304.3856845866.

The spelling of 28201530 in words is "twenty-eight million, two hundred one thousand, five hundred thirty".