123129992928 has 24 divisors (see below), whose sum is σ = 323216231688. Its totient is φ = 41043330944.

The previous prime is 123129992927. The next prime is 123129992929. The reversal of 123129992928 is 829299921321.

It is an interprime number because it is at equal distance from previous prime (123129992927) and next prime (123129992929).

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123129992927) 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, 641301951 + ... + 641302142.

It is an arithmetic number, because the mean of its divisors is an integer number (13467342987).

Almost surely, 2^123129992928 is an apocalyptic number.

It is an amenable number.

123129992928 is an abundant number, since it is smaller than the sum of its proper divisors (200086238760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123129992928 is a wasteful number, since it uses less digits than its factorization.

123129992928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1282604106 (or 1282604098 counting only the distinct ones).

The product of its digits is 2519424, while the sum is 57.

The spelling of 123129992928 in words is "one hundred twenty-three billion, one hundred twenty-nine million, nine hundred ninety-two thousand, nine hundred twenty-eight".