28769225 has 6 divisors (see below), whose sum is σ = 35673870. Its totient is φ = 23015360.

The previous prime is 28769207. The next prime is 28769233. The reversal of 28769225 is 52296782.

It can be written as a sum of positive squares in 3 ways, for example, as 4276624 + 24492601 = 2068^2 + 4949^2 .

It is a de Polignac number, because none of the positive numbers 2^k-28769225 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 575360 + ... + 575409.

It is an arithmetic number, because the mean of its divisors is an integer number (5945645).

Almost surely, 2^28769225 is an apocalyptic number.

28769225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28769225 is a deficient number, since it is larger than the sum of its proper divisors (6904645).

28769225 is a wasteful number, since it uses less digits than its factorization.

28769225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1150779 (or 1150774 counting only the distinct ones).

The product of its digits is 120960, while the sum is 41.

The square root of 28769225 is about 5363.6950882764. The cubic root of 28769225 is about 306.4145526893.

The spelling of 28769225 in words is "twenty-eight million, seven hundred sixty-nine thousand, two hundred twenty-five".