28881575 has 6 divisors (see below), whose sum is σ = 35813184. Its totient is φ = 23105240.

The previous prime is 28881569. The next prime is 28881617. The reversal of 28881575 is 57518882.

It is not a de Polignac number, because 28881575 - 2⁸ = 28881319 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 577607 + ... + 577656.

It is an arithmetic number, because the mean of its divisors is an integer number (5968864).

Almost surely, 2^28881575 is an apocalyptic number.

28881575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28881575 is a deficient number, since it is larger than the sum of its proper divisors (6931609).

28881575 is a wasteful number, since it uses less digits than its factorization.

28881575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1155273 (or 1155268 counting only the distinct ones).

The product of its digits is 179200, while the sum is 44.

The square root of 28881575 is about 5374.1580735963. The cubic root of 28881575 is about 306.8129061237.

The spelling of 28881575 in words is "twenty-eight million, eight hundred eighty-one thousand, five hundred seventy-five".