28257508325 has 24 divisors (see below), whose sum is σ = 35731730880. Its totient is φ = 22162851200.

The previous prime is 28257508319. The next prime is 28257508369. The reversal of 28257508325 is 52380575282.

It is not a de Polignac number, because 28257508325 - 2¹⁰ = 28257507301 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28257508325.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 273257 + ... + 362193.

It is an arithmetic number, because the mean of its divisors is an integer number (1488822120).

Almost surely, 2^28257508325 is an apocalyptic number.

28257508325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28257508325 is a deficient number, since it is larger than the sum of its proper divisors (7474222555).

28257508325 is a wasteful number, since it uses less digits than its factorization.

28257508325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89197 (or 89192 counting only the distinct ones).

The product of its (nonzero) digits is 1344000, while the sum is 47.

The spelling of 28257508325 in words is "twenty-eight billion, two hundred fifty-seven million, five hundred eight thousand, three hundred twenty-five".