28162145 has 12 divisors (see below), whose sum is σ = 37146900. Its totient is φ = 20481120.

The previous prime is 28162129. The next prime is 28162153. The reversal of 28162145 is 54126182.

It can be written as a sum of positive squares in 2 ways, for example, as 20539024 + 7623121 = 4532^2 + 2761^2 .

It is not a de Polignac number, because 28162145 - 2⁴ = 28162129 is a prime.

It is a super-2 number, since 2×28162145² = 1586212822002050, which contains 22 as substring.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 22670 + ... + 23879.

It is an arithmetic number, because the mean of its divisors is an integer number (3095575).

Almost surely, 2^28162145 is an apocalyptic number.

It is an amenable number.

28162145 is a deficient number, since it is larger than the sum of its proper divisors (8984755).

28162145 is a wasteful number, since it uses less digits than its factorization.

28162145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46576 (or 46565 counting only the distinct ones).

The product of its digits is 3840, while the sum is 29.

The square root of 28162145 is about 5306.8017675432. The cubic root of 28162145 is about 304.2439214120.

It can be divided in two parts, 281 and 62145, that added together give a palindrome (62426).

The spelling of 28162145 in words is "twenty-eight million, one hundred sixty-two thousand, one hundred forty-five".