28745551223 has 16 divisors (see below), whose sum is σ = 29691878400. Its totient is φ = 27814993440.

The previous prime is 28745551207. The next prime is 28745551279. The reversal of 28745551223 is 32215554782.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 28745551223 - 2⁴ = 28745551207 is a prime.

It is a super-2 number, since 2×28745551223² (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 (28745551423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4313468 + ... + 4320126.

It is an arithmetic number, because the mean of its divisors is an integer number (1855742400).

Almost surely, 2^28745551223 is an apocalyptic number.

28745551223 is a deficient number, since it is larger than the sum of its proper divisors (946327177).

28745551223 is a wasteful number, since it uses less digits than its factorization.

28745551223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7822.

The product of its digits is 672000, while the sum is 44.

The spelling of 28745551223 in words is "twenty-eight billion, seven hundred forty-five million, five hundred fifty-one thousand, two hundred twenty-three".