123451289028 has 84 divisors (see below), whose sum is σ = 324112641328. Its totient is φ = 41124872880.

The previous prime is 123451288967. The next prime is 123451289041. The reversal of 123451289028 is 820982154321.

123451289028 is a `hidden beast` number, since 1 + 2 + 34 + 512 + 89 + 0 + 28 = 666.

It is an unprimeable number.

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 27 ways as a sum of consecutive naturals, for example, 5011983 + ... + 5036553.

Almost surely, 2^123451289028 is an apocalyptic number.

123451289028 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123451289028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162056320664).

123451289028 is an abundant number, since it is smaller than the sum of its proper divisors (200661352300).

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

123451289028 is a wasteful number, since it uses less digits than its factorization.

123451289028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26316 (or 26299 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The spelling of 123451289028 in words is "one hundred twenty-three billion, four hundred fifty-one million, two hundred eighty-nine thousand, twenty-eight".