28988805 has 16 divisors (see below), whose sum is σ = 46474560. Its totient is φ = 15429888.

The previous prime is 28988783. The next prime is 28988807. The reversal of 28988805 is 50888982.

It is not a de Polignac number, because 28988805 - 2¹⁰ = 28987781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28988807) 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, 7266 + ... + 10524.

It is an arithmetic number, because the mean of its divisors is an integer number (2904660).

Almost surely, 2^28988805 is an apocalyptic number.

It is an amenable number.

28988805 is a deficient number, since it is larger than the sum of its proper divisors (17485755).

28988805 is a wasteful number, since it uses less digits than its factorization.

28988805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3860.

The product of its (nonzero) digits is 368640, while the sum is 48.

The square root of 28988805 is about 5384.1252771458. The cubic root of 28988805 is about 307.1921434724.

The spelling of 28988805 in words is "twenty-eight million, nine hundred eighty-eight thousand, eight hundred five".