28749031369 has 4 divisors (see below), whose sum is σ = 28762652160. Its totient is φ = 28735410580.

The previous prime is 28749031349. The next prime is 28749031387. The reversal of 28749031369 is 96313094782.

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 28749031369 - 2²³ = 28740642761 is a prime.

It is a super-2 number, since 2×28749031369² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28749031319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6807229 + ... + 6811450.

It is an arithmetic number, because the mean of its divisors is an integer number (7190663040).

Almost surely, 2^28749031369 is an apocalyptic number.

It is an amenable number.

28749031369 is a deficient number, since it is larger than the sum of its proper divisors (13620791).

28749031369 is a wasteful number, since it uses less digits than its factorization.

28749031369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13620790.

The product of its (nonzero) digits is 1959552, while the sum is 52.

The spelling of 28749031369 in words is "twenty-eight billion, seven hundred forty-nine million, thirty-one thousand, three hundred sixty-nine".