28263385625 has 20 divisors (see below), whose sum is σ = 35765051520. Its totient is φ = 22324458000.

The previous prime is 28263385621. The next prime is 28263385643. The reversal of 28263385625 is 52658336282.

It is a happy number.

It is not a de Polignac number, because 28263385625 - 2² = 28263385621 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28263385621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 236837 + ... + 335586.

It is an arithmetic number, because the mean of its divisors is an integer number (1788252576).

Almost surely, 2^28263385625 is an apocalyptic number.

28263385625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28263385625 is a deficient number, since it is larger than the sum of its proper divisors (7501665895).

28263385625 is an frugal number, since it uses more digits than its factorization.

28263385625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572522 (or 572507 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 50.

The spelling of 28263385625 in words is "twenty-eight billion, two hundred sixty-three million, three hundred eighty-five thousand, six hundred twenty-five".