28506697 has 4 divisors (see below), whose sum is σ = 28617876. Its totient is φ = 28395520.

The previous prime is 28506677. The next prime is 28506743. The reversal of 28506697 is 79660582.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12538681 + 15968016 = 3541^2 + 3996^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28506697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28506677) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55204 + ... + 55717.

It is an arithmetic number, because the mean of its divisors is an integer number (7154469).

Almost surely, 2^28506697 is an apocalyptic number.

It is an amenable number.

28506697 is a deficient number, since it is larger than the sum of its proper divisors (111179).

28506697 is a wasteful number, since it uses less digits than its factorization.

28506697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111178.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 28506697 is about 5339.1663206909. The cubic root of 28506697 is about 305.4796609205.

The spelling of 28506697 in words is "twenty-eight million, five hundred six thousand, six hundred ninety-seven".