28081145 has 8 divisors (see below), whose sum is σ = 35471040. Its totient is φ = 21282480.

The previous prime is 28081117. The next prime is 28081153. The reversal of 28081145 is 54118082.

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

It is a de Polignac number, because none of the positive numbers 2^k-28081145 is a prime.

It is a super-2 number, since 2×28081145² = 1577101409022050, which contains 22 as substring.

It is a Curzon number.

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 7 ways as a sum of consecutive naturals, for example, 147701 + ... + 147890.

It is an arithmetic number, because the mean of its divisors is an integer number (4433880).

Almost surely, 2^28081145 is an apocalyptic number.

It is an amenable number.

28081145 is a deficient number, since it is larger than the sum of its proper divisors (7389895).

28081145 is a wasteful number, since it uses less digits than its factorization.

28081145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295615.

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 28081145 is about 5299.1645567957. The cubic root of 28081145 is about 303.9519523845.

The spelling of 28081145 in words is "twenty-eight million, eighty-one thousand, one hundred forty-five".