28875577 has 4 divisors (see below), whose sum is σ = 29656036. Its totient is φ = 28095120.

The previous prime is 28875547. The next prime is 28875599. The reversal of 28875577 is 77557882.

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: 77557882 = 2 ⋅38778941.

It can be written as a sum of positive squares in 2 ways, for example, as 10394176 + 18481401 = 3224^2 + 4299^2 .

It is a cyclic number.

It is not a de Polignac number, because 28875577 - 2¹¹ = 28873529 is a prime.

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 28875577.

It is not an unprimeable number, because it can be changed into a prime (28875547) 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, 390174 + ... + 390247.

It is an arithmetic number, because the mean of its divisors is an integer number (7414009).

Almost surely, 2^28875577 is an apocalyptic number.

It is an amenable number.

28875577 is a deficient number, since it is larger than the sum of its proper divisors (780459).

28875577 is an equidigital number, since it uses as much as digits as its factorization.

28875577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780458.

The product of its digits is 1097600, while the sum is 49.

The square root of 28875577 is about 5373.6000037219. The cubic root of 28875577 is about 306.7916654628.

It can be divided in two parts, 2887 and 5577, that added together give a square (8464 = 92²).

The spelling of 28875577 in words is "twenty-eight million, eight hundred seventy-five thousand, five hundred seventy-seven".