28865551 has 16 divisors (see below), whose sum is σ = 34278048. Its totient is φ = 23961600.

The previous prime is 28865537. The next prime is 28865563. The reversal of 28865551 is 15556882.

It is not a de Polignac number, because 28865551 - 2⁵ = 28865519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28865521) by changing a digit.

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, 12831 + ... + 14911.

It is an arithmetic number, because the mean of its divisors is an integer number (2142378).

Almost surely, 2^28865551 is an apocalyptic number.

28865551 is a deficient number, since it is larger than the sum of its proper divisors (5412497).

28865551 is a wasteful number, since it uses less digits than its factorization.

28865551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2202.

The product of its digits is 96000, while the sum is 40.

The square root of 28865551 is about 5372.6670285809. The cubic root of 28865551 is about 306.7561539150.

The spelling of 28865551 in words is "twenty-eight million, eight hundred sixty-five thousand, five hundred fifty-one".