28655573 has 4 divisors (see below), whose sum is σ = 28815840. Its totient is φ = 28495308.

The previous prime is 28655503. The next prime is 28655581. The reversal of 28655573 is 37555682.

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, and also an emirpimes, since its reverse is a distinct semiprime: 37555682 = 2 ⋅18777841.

It is a cyclic number.

It is not a de Polignac number, because 28655573 - 2⁸ = 28655317 is a prime.

It is a super-2 number, since 2×28655573² = 1642283727916658, which contains 22 as substring.

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 28655573.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28655503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79865 + ... + 80222.

It is an arithmetic number, because the mean of its divisors is an integer number (7203960).

Almost surely, 2^28655573 is an apocalyptic number.

It is an amenable number.

28655573 is a deficient number, since it is larger than the sum of its proper divisors (160267).

28655573 is a wasteful number, since it uses less digits than its factorization.

28655573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160266.

The product of its digits is 252000, while the sum is 41.

The square root of 28655573 is about 5353.0900422093. The cubic root of 28655573 is about 306.0105262160.

It can be divided in two parts, 28655 and 573, that multiplied together give a triangular number (16419315 = T₅₇₃₀).

The spelling of 28655573 in words is "twenty-eight million, six hundred fifty-five thousand, five hundred seventy-three".