28215885 has 16 divisors (see below), whose sum is σ = 45216000. Its totient is φ = 15024960.

The previous prime is 28215851. The next prime is 28215899. The reversal of 28215885 is 58851282.

It is not a de Polignac number, because 28215885 - 2⁷ = 28215757 is a prime.

It is a super-2 number, since 2×28215885² = 1592272332666450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13116 + ... + 15114.

It is an arithmetic number, because the mean of its divisors is an integer number (2826000).

Almost surely, 2^28215885 is an apocalyptic number.

It is an amenable number.

28215885 is a deficient number, since it is larger than the sum of its proper divisors (17000115).

28215885 is a wasteful number, since it uses less digits than its factorization.

28215885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2948.

The product of its digits is 51200, while the sum is 39.

The square root of 28215885 is about 5311.8626676525. The cubic root of 28215885 is about 304.4373214462.

The spelling of 28215885 in words is "twenty-eight million, two hundred fifteen thousand, eight hundred eighty-five".