28205511552 has 256 divisors, whose sum is σ = 88725312000. Its totient is φ = 8905324032.

The previous prime is 28205511443. The next prime is 28205511557. The reversal of 28205511552 is 25511550282.

28205511552 is a `hidden beast` number, since 28 + 20 + 55 + 11 + 552 = 666.

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 (28205511557) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5316133 + ... + 5321435.

It is an arithmetic number, because the mean of its divisors is an integer number (346583250).

Almost surely, 2^28205511552 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28205511552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44362656000).

28205511552 is an abundant number, since it is smaller than the sum of its proper divisors (60519800448).

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

28205511552 is an frugal number, since it uses more digits than its factorization.

28205511552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5357 (or 5327 counting only the distinct ones).

The product of its (nonzero) digits is 40000, while the sum is 36.

The spelling of 28205511552 in words is "twenty-eight billion, two hundred five million, five hundred eleven thousand, five hundred fifty-two".