28048391909 has 16 divisors (see below), whose sum is σ = 28473951600. Its totient is φ = 27626887680.

The previous prime is 28048391893. The next prime is 28048391927. The reversal of 28048391909 is 90919384082.

It can be written as a sum of positive squares in 8 ways, for example, as 640596100 + 27407795809 = 25310^2 + 165553^2 .

It is a cyclic number.

It is not a de Polignac number, because 28048391909 - 2⁴ = 28048391893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28048391309) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11778899 + ... + 11781279.

It is an arithmetic number, because the mean of its divisors is an integer number (1779621975).

Almost surely, 2^28048391909 is an apocalyptic number.

It is an amenable number.

28048391909 is a deficient number, since it is larger than the sum of its proper divisors (425559691).

28048391909 is a wasteful number, since it uses less digits than its factorization.

28048391909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3160.

The product of its (nonzero) digits is 1119744, while the sum is 53.

The spelling of 28048391909 in words is "twenty-eight billion, forty-eight million, three hundred ninety-one thousand, nine hundred nine".