28265777 has 4 divisors (see below), whose sum is σ = 28583460. Its totient is φ = 27948096.

The previous prime is 28265767. The next prime is 28265791. The reversal of 28265777 is 77756282.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77756282 = 2 ⋅38878141.

It can be written as a sum of positive squares in 2 ways, for example, as 10491121 + 17774656 = 3239^2 + 4216^2 .

It is a cyclic number.

It is not a de Polignac number, because 28265777 - 2¹⁶ = 28200241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28265717) 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, 158708 + ... + 158885.

It is an arithmetic number, because the mean of its divisors is an integer number (7145865).

Almost surely, 2^28265777 is an apocalyptic number.

It is an amenable number.

28265777 is a deficient number, since it is larger than the sum of its proper divisors (317683).

28265777 is an equidigital number, since it uses as much as digits as its factorization.

28265777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317682.

The product of its digits is 329280, while the sum is 44.

The square root of 28265777 is about 5316.5568745194. The cubic root of 28265777 is about 304.6166535626.

The spelling of 28265777 in words is "twenty-eight million, two hundred sixty-five thousand, seven hundred seventy-seven".