28005555253 has 4 divisors (see below), whose sum is σ = 30159828748. Its totient is φ = 25851281760.

The previous prime is 28005555199. The next prime is 28005555257. The reversal of 28005555253 is 35255550082.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5335133764 + 22670421489 = 73042^2 + 150567^2 .

It is a cyclic number.

It is not a de Polignac number, because 28005555253 - 2¹³ = 28005547061 is a prime.

It is a super-2 number, since 2×28005555253² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 1077136728 + ... + 1077136753.

It is an arithmetic number, because the mean of its divisors is an integer number (7539957187).

Almost surely, 2^28005555253 is an apocalyptic number.

It is an amenable number.

28005555253 is a deficient number, since it is larger than the sum of its proper divisors (2154273495).

28005555253 is a wasteful number, since it uses less digits than its factorization.

28005555253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2154273494.

The product of its (nonzero) digits is 300000, while the sum is 40.

The spelling of 28005555253 in words is "twenty-eight billion, five million, five hundred fifty-five thousand, two hundred fifty-three".