28570530 has 48 divisors (see below), whose sum is σ = 70924032. Its totient is φ = 7365600.

The previous prime is 28570519. The next prime is 28570543. The reversal of 28570530 is 3507582.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28335 + ... + 29325.

It is an arithmetic number, because the mean of its divisors is an integer number (1477584).

Almost surely, 2^28570530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28570530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35462016).

28570530 is an abundant number, since it is smaller than the sum of its proper divisors (42353502).

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

28570530 is a wasteful number, since it uses less digits than its factorization.

28570530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1063 (or 1032 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 28570530 is about 5345.1407839270. The cubic root of 28570530 is about 305.7075038320.

The spelling of 28570530 in words is "twenty-eight million, five hundred seventy thousand, five hundred thirty".