28169745 has 8 divisors (see below), whose sum is σ = 45071616. Its totient is φ = 15023856.

The previous prime is 28169737. The next prime is 28169749. The reversal of 28169745 is 54796182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28169745 - 2³ = 28169737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28169697 and 28169706.

It is not an unprimeable number, because it can be changed into a prime (28169749) 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 7 ways as a sum of consecutive naturals, for example, 938977 + ... + 939006.

It is an arithmetic number, because the mean of its divisors is an integer number (5633952).

Almost surely, 2^28169745 is an apocalyptic number.

It is an amenable number.

28169745 is a deficient number, since it is larger than the sum of its proper divisors (16901871).

28169745 is a wasteful number, since it uses less digits than its factorization.

28169745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1877991.

The product of its digits is 120960, while the sum is 42.

The square root of 28169745 is about 5307.5177814116. The cubic root of 28169745 is about 304.2712872942.

It can be divided in two parts, 2816 and 9745, that added together give a triangular number (12561 = T₁₅₈).

The spelling of 28169745 in words is "twenty-eight million, one hundred sixty-nine thousand, seven hundred forty-five".