28840553280 has 1008 divisors, whose sum is σ = 130322848320. Its totient is φ = 5982197760.

The previous prime is 28840553279. The next prime is 28840553293. The reversal of 28840553280 is 8235504882.

28840553280 is a `hidden beast` number, since 288 + 40 + 5 + 5 + 328 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (1008).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 51226279 + ... + 51226841.

It is an arithmetic number, because the mean of its divisors is an integer number (129288540).

Almost surely, 2^28840553280 is an apocalyptic number.

28840553280 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 28840553280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65161424160).

28840553280 is an abundant number, since it is smaller than the sum of its proper divisors (101482295040).

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

28840553280 is a wasteful number, since it uses less digits than its factorization.

28840553280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625 (or 591 counting only the distinct ones).

The product of its (nonzero) digits is 614400, while the sum is 45.

The spelling of 28840553280 in words is "twenty-eight billion, eight hundred forty million, five hundred fifty-three thousand, two hundred eighty".