28424285 has 16 divisors (see below), whose sum is σ = 36039360. Its totient is φ = 21461760.

The previous prime is 28424243. The next prime is 28424287. The reversal of 28424285 is 58242482.

It is not a de Polignac number, because 28424285 - 2¹⁰ = 28423261 is a prime.

It is a super-2 number, since 2×28424285² = 1615879955522450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28424287) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40790 + ... + 41480.

It is an arithmetic number, because the mean of its divisors is an integer number (2252460).

Almost surely, 2^28424285 is an apocalyptic number.

It is an amenable number.

28424285 is a deficient number, since it is larger than the sum of its proper divisors (7615075).

28424285 is a wasteful number, since it uses less digits than its factorization.

28424285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1148.

The product of its digits is 40960, while the sum is 35.

The square root of 28424285 is about 5331.4430504320. The cubic root of 28424285 is about 305.1849992942.

The spelling of 28424285 in words is "twenty-eight million, four hundred twenty-four thousand, two hundred eighty-five".