28055555 has 8 divisors (see below), whose sum is σ = 36727344. Its totient is φ = 20404000.

The previous prime is 28055551. The next prime is 28055581. The reversal of 28055555 is 55555082.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28055555 - 2² = 28055551 is a prime.

It is a super-2 number, since 2×28055555² = 1574228332716050, which contains 22 as substring.

It is a Duffinian number.

28055555 is a modest number, since divided by 5555 gives 2805 as remainder.

It is not an unprimeable number, because it can be changed into a prime (28055551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 254996 + ... + 255105.

It is an arithmetic number, because the mean of its divisors is an integer number (4590918).

Almost surely, 2^28055555 is an apocalyptic number.

28055555 is a deficient number, since it is larger than the sum of its proper divisors (8671789).

28055555 is a wasteful number, since it uses less digits than its factorization.

28055555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510117.

The product of its (nonzero) digits is 50000, while the sum is 35.

The square root of 28055555 is about 5296.7494749138. The cubic root of 28055555 is about 303.8595951063.

The spelling of 28055555 in words is "twenty-eight million, fifty-five thousand, five hundred fifty-five".