28639055 has 8 divisors (see below), whose sum is σ = 34707744. Its totient is φ = 22684000.

The previous prime is 28639031. The next prime is 28639063. The reversal of 28639055 is 55093682.

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

It is not a de Polignac number, because 28639055 - 2²² = 24444751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27851 + ... + 28860.

It is an arithmetic number, because the mean of its divisors is an integer number (4338468).

Almost surely, 2^28639055 is an apocalyptic number.

28639055 is a deficient number, since it is larger than the sum of its proper divisors (6068689).

28639055 is a wasteful number, since it uses less digits than its factorization.

28639055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56817.

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 28639055 is about 5351.5469726052. The cubic root of 28639055 is about 305.9517167899.

The spelling of 28639055 in words is "twenty-eight million, six hundred thirty-nine thousand, fifty-five".