28044655 has 4 divisors (see below), whose sum is σ = 33653592. Its totient is φ = 22435720.

The previous prime is 28044617. The next prime is 28044691. The reversal of 28044655 is 55644082.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28044655 - 2¹¹ = 28042607 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 28044655.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2804461 + ... + 2804470.

It is an arithmetic number, because the mean of its divisors is an integer number (8413398).

Almost surely, 2^28044655 is an apocalyptic number.

28044655 is a deficient number, since it is larger than the sum of its proper divisors (5608937).

28044655 is an equidigital number, since it uses as much as digits as its factorization.

28044655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5608936.

The product of its (nonzero) digits is 38400, while the sum is 34.

The square root of 28044655 is about 5295.7204420173. The cubic root of 28044655 is about 303.8202386864.

The spelling of 28044655 in words is "twenty-eight million, forty-four thousand, six hundred fifty-five".