28055505 has 16 divisors (see below), whose sum is σ = 44956800. Its totient is φ = 14940288.

The previous prime is 28055483. The next prime is 28055539. The reversal of 28055505 is 50555082.

It is not a de Polignac number, because 28055505 - 2⁵ = 28055473 is a prime.

It is a super-2 number, since 2×28055505² = 1574222721610050, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14844 + ... + 16626.

It is an arithmetic number, because the mean of its divisors is an integer number (2809800).

Almost surely, 2^28055505 is an apocalyptic number.

It is an amenable number.

28055505 is a deficient number, since it is larger than the sum of its proper divisors (16901295).

28055505 is a wasteful number, since it uses less digits than its factorization.

28055505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2840.

The product of its (nonzero) digits is 10000, while the sum is 30.

The square root of 28055505 is about 5296.7447550359. The cubic root of 28055505 is about 303.8594145955.

The spelling of 28055505 in words is "twenty-eight million, fifty-five thousand, five hundred five".