28312121269 has 4 divisors (see below), whose sum is σ = 28312819744. Its totient is φ = 28311422796.

The previous prime is 28312121219. The next prime is 28312121287. The reversal of 28312121269 is 96212121382.

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 28312121269 - 2¹¹ = 28312119221 is a prime.

It is a super-2 number, since 2×28312121269² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28312121209) 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, 284427 + ... + 370840.

It is an arithmetic number, because the mean of its divisors is an integer number (7078204936).

Almost surely, 2^28312121269 is an apocalyptic number.

It is an amenable number.

28312121269 is a deficient number, since it is larger than the sum of its proper divisors (698475).

28312121269 is an equidigital number, since it uses as much as digits as its factorization.

28312121269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698474.

The product of its digits is 20736, while the sum is 37.

The spelling of 28312121269 in words is "twenty-eight billion, three hundred twelve million, one hundred twenty-one thousand, two hundred sixty-nine".