28786985125 has 16 divisors (see below), whose sum is σ = 36897140592. Its totient is φ = 22407163200.

The previous prime is 28786985107. The next prime is 28786985137. The reversal of 28786985125 is 52158968782.

It can be written as a sum of positive squares in 8 ways, for example, as 12741442884 + 16045542241 = 112878^2 + 126671^2 .

It is not a de Polignac number, because 28786985125 - 2⁹ = 28786984613 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3107482 + ... + 3116731.

It is an arithmetic number, because the mean of its divisors is an integer number (2306071287).

Almost surely, 2^28786985125 is an apocalyptic number.

28786985125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28786985125 is a deficient number, since it is larger than the sum of its proper divisors (8110155467).

28786985125 is an equidigital number, since it uses as much as digits as its factorization.

28786985125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6224265 (or 6224255 counting only the distinct ones).

The product of its digits is 19353600, while the sum is 61.

The spelling of 28786985125 in words is "twenty-eight billion, seven hundred eighty-six million, nine hundred eighty-five thousand, one hundred twenty-five".