28858385 has 4 divisors (see below), whose sum is σ = 34630068. Its totient is φ = 23086704.

The previous prime is 28858363. The next prime is 28858387. The reversal of 28858385 is 58385882.

It is a happy number.

It is a Cunningham number, because it is equal to 5372²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58385882 = 2 ⋅29192941.

It can be written as a sum of positive squares in 2 ways, for example, as 10394176 + 18464209 = 3224^2 + 4297^2 .

It is a cyclic number.

It is not a de Polignac number, because 28858385 - 2¹⁴ = 28842001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28858387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2885834 + ... + 2885843.

It is an arithmetic number, because the mean of its divisors is an integer number (8657517).

Almost surely, 2^28858385 is an apocalyptic number.

It is an amenable number.

28858385 is a deficient number, since it is larger than the sum of its proper divisors (5771683).

28858385 is an equidigital number, since it uses as much as digits as its factorization.

28858385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5771682.

The product of its digits is 614400, while the sum is 47.

The square root of 28858385 is about 5372.0000930752. Note that the first 4 decimals coincide. The cubic root of 28858385 is about 306.7307672926.

The spelling of 28858385 in words is "twenty-eight million, eight hundred fifty-eight thousand, three hundred eighty-five".