28380312033 has 4 divisors (see below), whose sum is σ = 37840416048. Its totient is φ = 18920208020.

The previous prime is 28380312031. The next prime is 28380312041. The reversal of 28380312033 is 33021308382.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28380312033 - 2¹ = 28380312031 is a prime.

It is a super-2 number, since 2×28380312033² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28380311985 and 28380312003.

It is not an unprimeable number, because it can be changed into a prime (28380312031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4730052003 + ... + 4730052008.

It is an arithmetic number, because the mean of its divisors is an integer number (9460104012).

Almost surely, 2^28380312033 is an apocalyptic number.

It is an amenable number.

28380312033 is a deficient number, since it is larger than the sum of its proper divisors (9460104015).

28380312033 is an equidigital number, since it uses as much as digits as its factorization.

28380312033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9460104014.

The product of its (nonzero) digits is 20736, while the sum is 33.

The spelling of 28380312033 in words is "twenty-eight billion, three hundred eighty million, three hundred twelve thousand, thirty-three".