28250307553 has 4 divisors (see below), whose sum is σ = 30423408148. Its totient is φ = 26077206960.

The previous prime is 28250307551. The next prime is 28250307557. The reversal of 28250307553 is 35570305282.

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 4339252129 + 23911055424 = 65873^2 + 154632^2 .

It is a cyclic number.

It is not a de Polignac number, because 28250307553 - 2¹ = 28250307551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28250307551) 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, 1086550278 + ... + 1086550303.

It is an arithmetic number, because the mean of its divisors is an integer number (7605852037).

Almost surely, 2^28250307553 is an apocalyptic number.

It is an amenable number.

28250307553 is a deficient number, since it is larger than the sum of its proper divisors (2173100595).

28250307553 is a wasteful number, since it uses less digits than its factorization.

28250307553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2173100594.

The product of its (nonzero) digits is 252000, while the sum is 40.

The spelling of 28250307553 in words is "twenty-eight billion, two hundred fifty million, three hundred seven thousand, five hundred fifty-three".