28128763123 has 32 divisors (see below), whose sum is σ = 31711680000. Its totient is φ = 24825284352.

The previous prime is 28128763099. The next prime is 28128763127. The reversal of 28128763123 is 32136782182.

It is a cyclic number.

It is not a de Polignac number, because 28128763123 - 2⁹ = 28128762611 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28128763123.

It is not an unprimeable number, because it can be changed into a prime (28128763127) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2805343 + ... + 2815351.

It is an arithmetic number, because the mean of its divisors is an integer number (990990000).

Almost surely, 2^28128763123 is an apocalyptic number.

28128763123 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

28128763123 is a deficient number, since it is larger than the sum of its proper divisors (3582916877).

28128763123 is a wasteful number, since it uses less digits than its factorization.

28128763123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10219.

The product of its digits is 193536, while the sum is 43.

The spelling of 28128763123 in words is "twenty-eight billion, one hundred twenty-eight million, seven hundred sixty-three thousand, one hundred twenty-three".