28165145 has 8 divisors (see below), whose sum is σ = 34045704. Its totient is φ = 22367104.

The previous prime is 28165117. The next prime is 28165147. The reversal of 28165145 is 54156182.

It can be written as a sum of positive squares in 4 ways, for example, as 5621641 + 22543504 = 2371^2 + 4748^2 .

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 28165145 - 2²² = 23970841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28165147) 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, 19874 + ... + 21243.

It is an arithmetic number, because the mean of its divisors is an integer number (4255713).

Almost surely, 2^28165145 is an apocalyptic number.

It is an amenable number.

28165145 is a deficient number, since it is larger than the sum of its proper divisors (5880559).

28165145 is a wasteful number, since it uses less digits than its factorization.

28165145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41259.

The product of its digits is 9600, while the sum is 32.

The square root of 28165145 is about 5307.0844161366. The cubic root of 28165145 is about 304.2547243220.

The spelling of 28165145 in words is "twenty-eight million, one hundred sixty-five thousand, one hundred forty-five".