28781450185 has 8 divisors (see below), whose sum is σ = 34539850440. Its totient is φ = 23023753344.

The previous prime is 28781450183. The next prime is 28781450213. The reversal of 28781450185 is 58105418782.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2702736 + 28778747449 = 1644^2 + 169643^2 .

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 28781450185 - 2¹ = 28781450183 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28781450183) 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, 81202 + ... + 253291.

It is an arithmetic number, because the mean of its divisors is an integer number (4317481305).

Almost surely, 2^28781450185 is an apocalyptic number.

It is an amenable number.

28781450185 is a deficient number, since it is larger than the sum of its proper divisors (5758400255).

28781450185 is a wasteful number, since it uses less digits than its factorization.

28781450185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351707.

The product of its (nonzero) digits is 716800, while the sum is 49.

The spelling of 28781450185 in words is "twenty-eight billion, seven hundred eighty-one million, four hundred fifty thousand, one hundred eighty-five".