28905000123 has 8 divisors (see below), whose sum is σ = 39480000336. Its totient is φ = 18800000000.

The previous prime is 28905000077. The next prime is 28905000139. The reversal of 28905000123 is 32100050982.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28905000123 - 2¹² = 28904996027 is a prime.

It is a super-2 number, since 2×28905000123² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28905000623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117499878 + ... + 117500123.

It is an arithmetic number, because the mean of its divisors is an integer number (4935000042).

Almost surely, 2^28905000123 is an apocalyptic number.

28905000123 is a deficient number, since it is larger than the sum of its proper divisors (10575000213).

28905000123 is a wasteful number, since it uses less digits than its factorization.

28905000123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235000045.

The product of its (nonzero) digits is 4320, while the sum is 30.

The spelling of 28905000123 in words is "twenty-eight billion, nine hundred five million, one hundred twenty-three", and thus it is an aban number.