28219026109 has 4 divisors (see below), whose sum is σ = 28286375040. Its totient is φ = 28151677180.

The previous prime is 28219026107. The next prime is 28219026133. The reversal of 28219026109 is 90162091282.

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 28219026109 - 2¹ = 28219026107 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 (28219026107) 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, 33673837 + ... + 33674674.

It is an arithmetic number, because the mean of its divisors is an integer number (7071593760).

Almost surely, 2^28219026109 is an apocalyptic number.

It is an amenable number.

28219026109 is a deficient number, since it is larger than the sum of its proper divisors (67348931).

28219026109 is an equidigital number, since it uses as much as digits as its factorization.

28219026109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67348930.

The product of its (nonzero) digits is 31104, while the sum is 40.

The spelling of 28219026109 in words is "twenty-eight billion, two hundred nineteen million, twenty-six thousand, one hundred nine".