28314802381 has 4 divisors (see below), whose sum is σ = 28436325372. Its totient is φ = 28193279392.

The previous prime is 28314802379. The next prime is 28314802391. The reversal of 28314802381 is 18320841382.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2283884100 + 26030918281 = 47790^2 + 161341^2 .

It is a cyclic number.

It is not a de Polignac number, because 28314802381 - 2¹ = 28314802379 is a prime.

It is a super-2 number, since 2×28314802381² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28314802391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60761146 + ... + 60761611.

It is an arithmetic number, because the mean of its divisors is an integer number (7109081343).

Almost surely, 2^28314802381 is an apocalyptic number.

It is an amenable number.

28314802381 is a deficient number, since it is larger than the sum of its proper divisors (121522991).

28314802381 is a wasteful number, since it uses less digits than its factorization.

28314802381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121522990.

The product of its (nonzero) digits is 73728, while the sum is 40.

The spelling of 28314802381 in words is "twenty-eight billion, three hundred fourteen million, eight hundred two thousand, three hundred eighty-one".