28356145 has 8 divisors (see below), whose sum is σ = 34081704. Its totient is φ = 22648704.

The previous prime is 28356143. The next prime is 28356149. The reversal of 28356145 is 54165382.

It can be written as a sum of positive squares in 4 ways, for example, as 5992704 + 22363441 = 2448^2 + 4729^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 28356145 - 2¹ = 28356143 is a prime.

It is a super-2 number, since 2×28356145² = 1608141918522050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28356145.

It is not an unprimeable number, because it can be changed into a prime (28356143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 804 + ... + 7573.

It is an arithmetic number, because the mean of its divisors is an integer number (4260213).

Almost surely, 2^28356145 is an apocalyptic number.

It is an amenable number.

28356145 is a deficient number, since it is larger than the sum of its proper divisors (5725559).

28356145 is an equidigital number, since it uses as much as digits as its factorization.

28356145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9059.

The product of its digits is 28800, while the sum is 34.

The square root of 28356145 is about 5325.0488260672. The cubic root of 28356145 is about 304.9409363369.

The spelling of 28356145 in words is "twenty-eight million, three hundred fifty-six thousand, one hundred forty-five".