28305129625 has 24 divisors (see below), whose sum is σ = 37525010328. Its totient is φ = 21312070400.

The previous prime is 28305129623. The next prime is 28305129631. The reversal of 28305129625 is 52692150382.

It can be written as a sum of positive squares in 12 ways, for example, as 3898254096 + 24406875529 = 62436^2 + 156227^2 .

It is not a de Polignac number, because 28305129625 - 2¹ = 28305129623 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28305129623) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 355642 + ... + 427891.

It is an arithmetic number, because the mean of its divisors is an integer number (1563542097).

Almost surely, 2^28305129625 is an apocalyptic number.

28305129625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28305129625 is a deficient number, since it is larger than the sum of its proper divisors (9219880703).

28305129625 is an equidigital number, since it uses as much as digits as its factorization.

28305129625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 783582 (or 783555 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 43.

The spelling of 28305129625 in words is "twenty-eight billion, three hundred five million, one hundred twenty-nine thousand, six hundred twenty-five".