28005555252 has 24 divisors (see below), whose sum is σ = 66453861600. Its totient is φ = 9176961376.

The previous prime is 28005555199. The next prime is 28005555257. The reversal of 28005555252 is 25255550082.

It is a super-2 number, since 2×28005555252² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28005555252.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28005555257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19777227 + ... + 19778642.

It is an arithmetic number, because the mean of its divisors is an integer number (2768910900).

Almost surely, 2^28005555252 is an apocalyptic number.

It is an amenable number.

28005555252 is an abundant number, since it is smaller than the sum of its proper divisors (38448306348).

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

28005555252 is a wasteful number, since it uses less digits than its factorization.

28005555252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39555935 (or 39555933 counting only the distinct ones).

The product of its (nonzero) digits is 200000, while the sum is 39.

The spelling of 28005555252 in words is "twenty-eight billion, five million, five hundred fifty-five thousand, two hundred fifty-two".