28123117708560 has 320 divisors, whose sum is σ = 105668190945792. Its totient is φ = 6040205918208.

The previous prime is 28123117708523. The next prime is 28123117708561. The reversal of 28123117708560 is 6580771132182.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (28123117708561) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 16823544 + ... + 18419496.

Almost surely, 2^{28123117708560} is an apocalyptic number.

28123117708560 is a gapful number since it is divisible by the number (20) 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 28123117708560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52834095472896).

28123117708560 is an abundant number, since it is smaller than the sum of its proper divisors (77545073237232).

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

28123117708560 is a wasteful number, since it uses less digits than its factorization.

28123117708560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1596610 (or 1596604 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 51.

The spelling of 28123117708560 in words is "twenty-eight trillion, one hundred twenty-three billion, one hundred seventeen million, seven hundred eight thousand, five hundred sixty".