28081800145 has 8 divisors (see below), whose sum is σ = 38512183104. Its totient is φ = 19256091504.

The previous prime is 28081800137. The next prime is 28081800157. The reversal of 28081800145 is 54100818082.

It is a happy number.

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 28081800145 - 2³ = 28081800137 is a prime.

It is a Duffinian 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, 401168539 + ... + 401168608.

It is an arithmetic number, because the mean of its divisors is an integer number (4814022888).

Almost surely, 2^28081800145 is an apocalyptic number.

It is an amenable number.

28081800145 is a deficient number, since it is larger than the sum of its proper divisors (10430382959).

28081800145 is an equidigital number, since it uses as much as digits as its factorization.

28081800145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 802337159.

The product of its (nonzero) digits is 20480, while the sum is 37.

The spelling of 28081800145 in words is "twenty-eight billion, eighty-one million, eight hundred thousand, one hundred forty-five".