28148629009 has 4 divisors (see below), whose sum is σ = 28909402804. Its totient is φ = 27387855216.

The previous prime is 28148629001. The next prime is 28148629037. The reversal of 28148629009 is 90092684182.

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 20705771025 + 7442857984 = 143895^2 + 86272^2 .

It is a cyclic number.

It is not a de Polignac number, because 28148629009 - 2³ = 28148629001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28148629001) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 380386842 + ... + 380386915.

It is an arithmetic number, because the mean of its divisors is an integer number (7227350701).

Almost surely, 2^28148629009 is an apocalyptic number.

It is an amenable number.

28148629009 is a deficient number, since it is larger than the sum of its proper divisors (760773795).

28148629009 is an equidigital number, since it uses as much as digits as its factorization.

28148629009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 760773794.

The product of its (nonzero) digits is 497664, while the sum is 49.

The spelling of 28148629009 in words is "twenty-eight billion, one hundred forty-eight million, six hundred twenty-nine thousand, nine".