28506771 has 12 divisors (see below), whose sum is σ = 41277600. Its totient is φ = 18957840.

The previous prime is 28506757. The next prime is 28506781. The reversal of 28506771 is 17760582.

It is not a de Polignac number, because 28506771 - 2¹⁰ = 28505747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28506781) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 205 + ... + 7553.

It is an arithmetic number, because the mean of its divisors is an integer number (3439800).

Almost surely, 2^28506771 is an apocalyptic number.

28506771 is a deficient number, since it is larger than the sum of its proper divisors (12770829).

28506771 is a wasteful number, since it uses less digits than its factorization.

28506771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7786 (or 7783 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 28506771 is about 5339.1732506073. The cubic root of 28506771 is about 305.4799252499.

The spelling of 28506771 in words is "twenty-eight million, five hundred six thousand, seven hundred seventy-one".