28169901813 has 4 divisors (see below), whose sum is σ = 37559869088. Its totient is φ = 18779934540.

The previous prime is 28169901763. The next prime is 28169901829. The reversal of 28169901813 is 31810996182.

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 28169901813 - 2¹³ = 28169893621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28169901853) 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, 4694983633 + ... + 4694983638.

It is an arithmetic number, because the mean of its divisors is an integer number (9389967272).

Almost surely, 2^28169901813 is an apocalyptic number.

It is an amenable number.

28169901813 is a deficient number, since it is larger than the sum of its proper divisors (9389967275).

28169901813 is an equidigital number, since it uses as much as digits as its factorization.

28169901813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9389967274.

The product of its (nonzero) digits is 186624, while the sum is 48.

The spelling of 28169901813 in words is "twenty-eight billion, one hundred sixty-nine million, nine hundred one thousand, eight hundred thirteen".