28415505 has 16 divisors (see below), whose sum is σ = 47033280. Its totient is φ = 14632128.

The previous prime is 28415489. The next prime is 28415531. The reversal of 28415505 is 50551482.

It is not a de Polignac number, because 28415505 - 2⁴ = 28415489 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32227 + ... + 33096.

It is an arithmetic number, because the mean of its divisors is an integer number (2939580).

Almost surely, 2^28415505 is an apocalyptic number.

It is an amenable number.

28415505 is a deficient number, since it is larger than the sum of its proper divisors (18617775).

28415505 is a wasteful number, since it uses less digits than its factorization.

28415505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65360.

The product of its (nonzero) digits is 8000, while the sum is 30.

The square root of 28415505 is about 5330.6195699937. The cubic root of 28415505 is about 305.1535731125.

Adding to 28415505 its reverse (50551482), we get a palindrome (78966987).

It can be divided in two parts, 28415 and 505, that added together give a triangular number (28920 = T₂₄₀).

The spelling of 28415505 in words is "twenty-eight million, four hundred fifteen thousand, five hundred five".