28890055 has 16 divisors (see below), whose sum is σ = 36867744. Its totient is φ = 21657600.

The previous prime is 28890053. The next prime is 28890067. The reversal of 28890055 is 55009882.

It is a happy number.

It is not a de Polignac number, because 28890055 - 2¹ = 28890053 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28889996 and 28890023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28890053) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23455 + ... + 24655.

It is an arithmetic number, because the mean of its divisors is an integer number (2304234).

Almost surely, 2^28890055 is an apocalyptic number.

28890055 is a deficient number, since it is larger than the sum of its proper divisors (7977689).

28890055 is a wasteful number, since it uses less digits than its factorization.

28890055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1506.

The product of its (nonzero) digits is 28800, while the sum is 37.

The square root of 28890055 is about 5374.9469764827. The cubic root of 28890055 is about 306.8429312504.

The spelling of 28890055 in words is "twenty-eight million, eight hundred ninety thousand, fifty-five".