28801305 has 32 divisors (see below), whose sum is σ = 55144320. Its totient is φ = 14178240.

The previous prime is 28801243. The next prime is 28801307. The reversal of 28801305 is 50310882.

It is a happy number.

It is not a de Polignac number, because 28801305 - 2⁸ = 28801049 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (28801307) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6451 + ... + 9960.

It is an arithmetic number, because the mean of its divisors is an integer number (1723260).

Almost surely, 2^28801305 is an apocalyptic number.

It is an amenable number.

28801305 is a deficient number, since it is larger than the sum of its proper divisors (26343015).

28801305 is a wasteful number, since it uses less digits than its factorization.

28801305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16438 (or 16432 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 28801305 is about 5366.6847308185. The cubic root of 28801305 is about 306.5284026736.

The spelling of 28801305 in words is "twenty-eight million, eight hundred one thousand, three hundred five".