28506775 has 24 divisors (see below), whose sum is σ = 40247424. Its totient is φ = 19826400.

The previous prime is 28506757. The next prime is 28506781. The reversal of 28506775 is 57760582.

It is not a de Polignac number, because 28506775 - 2⁵ = 28506743 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, 4072 + ... + 8578.

It is an arithmetic number, because the mean of its divisors is an integer number (1676976).

Almost surely, 2^28506775 is an apocalyptic number.

28506775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28506775 is a deficient number, since it is larger than the sum of its proper divisors (11740649).

28506775 is a wasteful number, since it uses less digits than its factorization.

28506775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4551 (or 4546 counting only the distinct ones).

The product of its (nonzero) digits is 117600, while the sum is 40.

The square root of 28506775 is about 5339.1736251971. The cubic root of 28506775 is about 305.4799395380.

The spelling of 28506775 in words is "twenty-eight million, five hundred six thousand, seven hundred seventy-five".