28758626209 has 4 divisors (see below), whose sum is σ = 29187859504. Its totient is φ = 28329392916.

The previous prime is 28758626203. The next prime is 28758626231. The reversal of 28758626209 is 90262685782.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28758626209 - 2¹¹ = 28758624161 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28758626209.

It is not an unprimeable number, because it can be changed into a prime (28758626203) 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, 214616547 + ... + 214616680.

It is an arithmetic number, because the mean of its divisors is an integer number (7296964876).

Almost surely, 2^28758626209 is an apocalyptic number.

It is an amenable number.

28758626209 is a deficient number, since it is larger than the sum of its proper divisors (429233295).

28758626209 is an equidigital number, since it uses as much as digits as its factorization.

28758626209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429233294.

The product of its (nonzero) digits is 5806080, while the sum is 55.

The spelling of 28758626209 in words is "twenty-eight billion, seven hundred fifty-eight million, six hundred twenty-six thousand, two hundred nine".