28321750648344 has 144 divisors (see below), whose sum is σ = 77215389368760. Its totient is φ = 8655201388800.

The previous prime is 28321750648339. The next prime is 28321750648351. The reversal of 28321750648344 is 44384605712382.

It is a happy number.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

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 35 ways as a sum of consecutive naturals, for example, 6625324 + ... + 10026884.

Almost surely, 2^{28321750648344} is an apocalyptic number.

28321750648344 is a gapful number since it is divisible by the number (24) 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 28321750648344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38607694684380).

28321750648344 is an abundant number, since it is smaller than the sum of its proper divisors (48893638720416).

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

28321750648344 is a wasteful number, since it uses less digits than its factorization.

28321750648344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3401670 (or 3401616 counting only the distinct ones).

The product of its (nonzero) digits is 30965760, while the sum is 57.

The spelling of 28321750648344 in words is "twenty-eight trillion, three hundred twenty-one billion, seven hundred fifty million, six hundred forty-eight thousand, three hundred forty-four".