28405285237180 has 96 divisors (see below), whose sum is σ = 63052403097600. Its totient is φ = 10733916061440.

The previous prime is 28405285237169. The next prime is 28405285237349. The reversal of 28405285237180 is 8173258250482.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4367197 + ... + 8711083.

It is an arithmetic number, because the mean of its divisors is an integer number (656795865600).

Almost surely, 2^{28405285237180} is an apocalyptic number.

28405285237180 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 28405285237180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31526201548800).

28405285237180 is an abundant number, since it is smaller than the sum of its proper divisors (34647117860420).

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

28405285237180 is a wasteful number, since it uses less digits than its factorization.

28405285237180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4344179 (or 4344177 counting only the distinct ones).

The product of its (nonzero) digits is 8601600, while the sum is 55.

It can be divided in two parts, 2840528 and 5237180, that added together give a palindrome (8077708).

The spelling of 28405285237180 in words is "twenty-eight trillion, four hundred five billion, two hundred eighty-five million, two hundred thirty-seven thousand, one hundred eighty".