28144577 has 4 divisors (see below), whose sum is σ = 28160340. Its totient is φ = 28128816.

The previous prime is 28144561. The next prime is 28144579. The reversal of 28144577 is 77544182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77544182 = 2 ⋅38772091.

It can be written as a sum of positive squares in 2 ways, for example, as 19855936 + 8288641 = 4456^2 + 2879^2 .

It is a cyclic number.

It is not a de Polignac number, because 28144577 - 2⁴ = 28144561 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 28144577.

It is not an unprimeable number, because it can be changed into a prime (28144579) 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, 4802 + ... + 8907.

It is an arithmetic number, because the mean of its divisors is an integer number (7040085).

Almost surely, 2^28144577 is an apocalyptic number.

It is an amenable number.

28144577 is a deficient number, since it is larger than the sum of its proper divisors (15763).

28144577 is a wasteful number, since it uses less digits than its factorization.

28144577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15762.

The product of its digits is 62720, while the sum is 38.

The square root of 28144577 is about 5305.1462750805. The cubic root of 28144577 is about 304.1806441649.

The spelling of 28144577 in words is "twenty-eight million, one hundred forty-four thousand, five hundred seventy-seven".