28038905121 has 4 divisors (see below), whose sum is σ = 37385206832. Its totient is φ = 18692603412.

The previous prime is 28038905101. The next prime is 28038905129. The reversal of 28038905121 is 12150983082.

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 not a de Polignac number, because 28038905121 - 2¹⁵ = 28038872353 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28038905121.

It is not an unprimeable number, because it can be changed into a prime (28038905129) 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, 4673150851 + ... + 4673150856.

It is an arithmetic number, because the mean of its divisors is an integer number (9346301708).

Almost surely, 2^28038905121 is an apocalyptic number.

It is an amenable number.

28038905121 is a deficient number, since it is larger than the sum of its proper divisors (9346301711).

28038905121 is an equidigital number, since it uses as much as digits as its factorization.

28038905121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9346301710.

The product of its (nonzero) digits is 34560, while the sum is 39.

The spelling of 28038905121 in words is "twenty-eight billion, thirty-eight million, nine hundred five thousand, one hundred twenty-one".