28581145 has 8 divisors (see below), whose sum is σ = 34355520. Its totient is φ = 22826160.

The previous prime is 28581143. The next prime is 28581169. The reversal of 28581145 is 54118582.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28581145 - 2¹ = 28581143 is a prime.

It is a super-2 number, since 2×28581145² = 1633763699022050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28581145.

It is not an unprimeable number, because it can be changed into a prime (28581143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1375 + ... + 7684.

It is an arithmetic number, because the mean of its divisors is an integer number (4294440).

Almost surely, 2^28581145 is an apocalyptic number.

It is an amenable number.

28581145 is a deficient number, since it is larger than the sum of its proper divisors (5774375).

28581145 is an equidigital number, since it uses as much as digits as its factorization.

28581145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9695.

The product of its digits is 12800, while the sum is 34.

The square root of 28581145 is about 5346.1336496575. The cubic root of 28581145 is about 305.7453596616.

The spelling of 28581145 in words is "twenty-eight million, five hundred eighty-one thousand, one hundred forty-five".