28775505 has 32 divisors (see below), whose sum is σ = 50935680. Its totient is φ = 13754880.

The previous prime is 28775491. The next prime is 28775521. The reversal of 28775505 is 50557782.

It is not a de Polignac number, because 28775505 - 2¹³ = 28767313 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10851 + ... + 13239.

It is an arithmetic number, because the mean of its divisors is an integer number (1591740).

Almost surely, 2^28775505 is an apocalyptic number.

It is an amenable number.

28775505 is a deficient number, since it is larger than the sum of its proper divisors (22160175).

28775505 is a wasteful number, since it uses less digits than its factorization.

28775505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2481.

The product of its (nonzero) digits is 98000, while the sum is 39.

The square root of 28775505 is about 5364.2804736516. The cubic root of 28775505 is about 306.4368466903.

The spelling of 28775505 in words is "twenty-eight million, seven hundred seventy-five thousand, five hundred five".