28380485185920 has 640 divisors, whose sum is σ = 118961285636160. Its totient is φ = 6311641595904.

The previous prime is 28380485185919. The next prime is 28380485185939. The reversal of 28380485185920 is 2958158408382.

28380485185920 is a `hidden beast` number, since 2 + 8 + 3 + 8 + 0 + 48 + 518 + 59 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (640).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 12369682 + ... + 14483438.

Almost surely, 2^{28380485185920} is an apocalyptic number.

28380485185920 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 28380485185920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59480642818080).

28380485185920 is an abundant number, since it is smaller than the sum of its proper divisors (90580800450240).

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

28380485185920 is a wasteful number, since it uses less digits than its factorization.

28380485185920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2113832 (or 2113811 counting only the distinct ones).

The product of its (nonzero) digits is 44236800, while the sum is 63.

The spelling of 28380485185920 in words is "twenty-eight trillion, three hundred eighty billion, four hundred eighty-five million, one hundred eighty-five thousand, nine hundred twenty".