28610042009 has 4 divisors (see below), whose sum is σ = 28682108004. Its totient is φ = 28537976016.

The previous prime is 28610042003. The next prime is 28610042029. The reversal of 28610042009 is 90024001682.

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 20269786384 + 8340255625 = 142372^2 + 91325^2 .

It is a cyclic number.

It is not a de Polignac number, because 28610042009 - 2¹² = 28610037913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28610042003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36032402 + ... + 36033195.

It is an arithmetic number, because the mean of its divisors is an integer number (7170527001).

Almost surely, 2^28610042009 is an apocalyptic number.

It is an amenable number.

28610042009 is a deficient number, since it is larger than the sum of its proper divisors (72065995).

28610042009 is an equidigital number, since it uses as much as digits as its factorization.

28610042009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72065994.

The product of its (nonzero) digits is 6912, while the sum is 32.

The spelling of 28610042009 in words is "twenty-eight billion, six hundred ten million, forty-two thousand, nine".