28260405 has 24 divisors (see below), whose sum is σ = 49320960. Its totient is φ = 14968800.

The previous prime is 28260389. The next prime is 28260431. The reversal of 28260405 is 50406282.

It is not a de Polignac number, because 28260405 - 2⁴ = 28260389 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4716 + ... + 8874.

It is an arithmetic number, because the mean of its divisors is an integer number (2055040).

Almost surely, 2^28260405 is an apocalyptic number.

It is an amenable number.

28260405 is a deficient number, since it is larger than the sum of its proper divisors (21060555).

28260405 is a wasteful number, since it uses less digits than its factorization.

28260405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4321 (or 4318 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 28260405 is about 5316.0516363181. The cubic root of 28260405 is about 304.5973545549.

Adding to 28260405 its reverse (50406282), we get a palindrome (78666687).

The spelling of 28260405 in words is "twenty-eight million, two hundred sixty thousand, four hundred five".