28580280 has 128 divisors (see below), whose sum is σ = 90780480. Its totient is φ = 7188480.

The previous prime is 28580231. The next prime is 28580297. The reversal of 28580280 is 8208582.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 181962 + ... + 182118.

Almost surely, 2^28580280 is an apocalyptic number.

28580280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28580280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45390240).

28580280 is an abundant number, since it is smaller than the sum of its proper divisors (62200200).

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

28580280 is a wasteful number, since it uses less digits than its factorization.

28580280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249 (or 245 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 33.

The square root of 28580280 is about 5346.0527494592. The cubic root of 28580280 is about 305.7422751992.

The spelling of 28580280 in words is "twenty-eight million, five hundred eighty thousand, two hundred eighty".