28965577 has 4 divisors (see below), whose sum is σ = 29964420. Its totient is φ = 27966736.

The previous prime is 28965571. The next prime is 28965581. The reversal of 28965577 is 77556982.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77556982 = 2 ⋅38778491.

It can be written as a sum of positive squares in 2 ways, for example, as 23853456 + 5112121 = 4884^2 + 2261^2 .

It is a cyclic number.

It is not a de Polignac number, because 28965577 - 2⁷ = 28965449 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28965577.

It is not an unprimeable number, because it can be changed into a prime (28965571) 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, 499378 + ... + 499435.

It is an arithmetic number, because the mean of its divisors is an integer number (7491105).

Almost surely, 2^28965577 is an apocalyptic number.

It is an amenable number.

28965577 is a deficient number, since it is larger than the sum of its proper divisors (998843).

28965577 is an equidigital number, since it uses as much as digits as its factorization.

28965577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 998842.

The product of its digits is 1058400, while the sum is 49.

The square root of 28965577 is about 5381.9677628169. The cubic root of 28965577 is about 307.1100731033.

The spelling of 28965577 in words is "twenty-eight million, nine hundred sixty-five thousand, five hundred seventy-seven".