28570880 has 144 divisors (see below), whose sum is σ = 78808464. Its totient is φ = 9830400.

The previous prime is 28570879. The next prime is 28570907. The reversal of 28570880 is 8807582.

It can be written as a sum of positive squares in 8 ways, for example, as 861184 + 27709696 = 928^2 + 5264^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 282830 + ... + 282930.

It is an arithmetic number, because the mean of its divisors is an integer number (547281).

Almost surely, 2^28570880 is an apocalyptic number.

28570880 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 28570880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39404232).

28570880 is an abundant number, since it is smaller than the sum of its proper divisors (50237584).

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

28570880 is a wasteful number, since it uses less digits than its factorization.

28570880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152 (or 138 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 38.

The square root of 28570880 is about 5345.1735238437. The cubic root of 28570880 is about 305.7087521718.

The spelling of 28570880 in words is "twenty-eight million, five hundred seventy thousand, eight hundred eighty".