28545556 has 12 divisors (see below), whose sum is σ = 53797492. Its totient is φ = 13174848.

The previous prime is 28545527. The next prime is 28545563. The reversal of 28545556 is 65554582.

It can be written as a sum of positive squares in 2 ways, for example, as 15729156 + 12816400 = 3966^2 + 3580^2 .

It is a super-3 number, since 3×28545556³ (a number of 23 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 274425 + ... + 274528.

Almost surely, 2^28545556 is an apocalyptic number.

28545556 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

28545556 is a deficient number, since it is larger than the sum of its proper divisors (25251936).

28545556 is a wasteful number, since it uses less digits than its factorization.

28545556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548970 (or 548968 counting only the distinct ones).

The product of its digits is 240000, while the sum is 40.

The square root of 28545556 is about 5342.8041326629. The cubic root of 28545556 is about 305.6184031067.

The spelling of 28545556 in words is "twenty-eight million, five hundred forty-five thousand, five hundred fifty-six".