28525777 has 4 divisors (see below), whose sum is σ = 32600896. Its totient is φ = 24450660.

The previous prime is 28525753. The next prime is 28525787. The reversal of 28525777 is 77752582.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28525777 - 2⁷ = 28525649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28525787) 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, 2037549 + ... + 2037562.

It is an arithmetic number, because the mean of its divisors is an integer number (8150224).

Almost surely, 2^28525777 is an apocalyptic number.

It is an amenable number.

28525777 is a deficient number, since it is larger than the sum of its proper divisors (4075119).

28525777 is an equidigital number, since it uses as much as digits as its factorization.

28525777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4075118.

The product of its digits is 274400, while the sum is 43.

The square root of 28525777 is about 5340.9528176160. The cubic root of 28525777 is about 305.5477999035.

It can be divided in two parts, 285 and 25777, that added together give a palindrome (26062).

The spelling of 28525777 in words is "twenty-eight million, five hundred twenty-five thousand, seven hundred seventy-seven".