28380280500 has 768 divisors, whose sum is σ = 110102952960. Its totient is φ = 6220800000.

The previous prime is 28380280457. The next prime is 28380280501. The reversal of 28380280500 is 508208382.

It is a super-4 number, since 4×28380280500⁴ (a number of 43 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28380280501) by changing a digit.

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 255 ways as a sum of consecutive naturals, for example, 117760380 + ... + 117760620.

It is an arithmetic number, because the mean of its divisors is an integer number (143363220).

Almost surely, 2^28380280500 is an apocalyptic number.

28380280500 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 28380280500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55051476480).

28380280500 is an abundant number, since it is smaller than the sum of its proper divisors (81722672460).

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

28380280500 is a wasteful number, since it uses less digits than its factorization.

28380280500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354 (or 336 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

Adding to 28380280500 its reverse (508208382), we get a palindrome (28888488882).

The spelling of 28380280500 in words is "twenty-eight billion, three hundred eighty million, two hundred eighty thousand, five hundred".