28005570 has 24 divisors (see below), whose sum is σ = 72814716. Its totient is φ = 7468128.

The previous prime is 28005569. The next prime is 28005623. The reversal of 28005570 is 7550082.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 27910089 + 95481 = 5283^2 + 309^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 155497 + ... + 155676.

Almost surely, 2^28005570 is an apocalyptic number.

28005570 is an abundant number, since it is smaller than the sum of its proper divisors (44809146).

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

28005570 is a wasteful number, since it uses less digits than its factorization.

28005570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311186 (or 311183 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

The square root of 28005570 is about 5292.0289114857. The cubic root of 28005570 is about 303.6790313294.

The spelling of 28005570 in words is "twenty-eight million, five thousand, five hundred seventy".