28002580 has 48 divisors (see below), whose sum is σ = 63000000. Its totient is φ = 10423296.

The previous prime is 28002551. The next prime is 28002593. The reversal of 28002580 is 8520082.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21796 + ... + 23044.

It is an arithmetic number, because the mean of its divisors is an integer number (1312500).

Almost surely, 2^28002580 is an apocalyptic number.

28002580 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 28002580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31500000).

28002580 is an abundant number, since it is smaller than the sum of its proper divisors (34997420).

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

28002580 is a wasteful number, since it uses less digits than its factorization.

28002580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1336 (or 1334 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 28002580 is about 5291.7464035987. The cubic root of 28002580 is about 303.6682235672.

It can be divided in two parts, 28002 and 580, that added together give a palindrome (28582).

The spelling of 28002580 in words is "twenty-eight million, two thousand, five hundred eighty".