28545505 has 16 divisors (see below), whose sum is σ = 36190080. Its totient is φ = 21555072.

The previous prime is 28545481. The next prime is 28545511. The reversal of 28545505 is 50554582.

It is a cyclic number.

It is not a de Polignac number, because 28545505 - 2¹⁷ = 28414433 is a prime.

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, 45957 + ... + 46573.

It is an arithmetic number, because the mean of its divisors is an integer number (2261880).

Almost surely, 2^28545505 is an apocalyptic number.

28545505 is the 3085-th octagonal number.

It is an amenable number.

28545505 is a deficient number, since it is larger than the sum of its proper divisors (7644575).

28545505 is a wasteful number, since it uses less digits than its factorization.

28545505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1128.

The product of its (nonzero) digits is 40000, while the sum is 34.

The square root of 28545505 is about 5342.7993598862. The cubic root of 28545505 is about 305.6182210989.

The spelling of 28545505 in words is "twenty-eight million, five hundred forty-five thousand, five hundred five".