28894311909 has 24 divisors (see below), whose sum is σ = 42343688192. Its totient is φ = 18984520800.

The previous prime is 28894311877. The next prime is 28894311911. The reversal of 28894311909 is 90911349882.

It is not a de Polignac number, because 28894311909 - 2⁵ = 28894311877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28894311709) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 88887 + ... + 256299.

Almost surely, 2^28894311909 is an apocalyptic number.

It is an amenable number.

28894311909 is a deficient number, since it is larger than the sum of its proper divisors (13449376283).

28894311909 is a wasteful number, since it uses less digits than its factorization.

28894311909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167697 (or 167694 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 54.

The spelling of 28894311909 in words is "twenty-eight billion, eight hundred ninety-four million, three hundred eleven thousand, nine hundred nine".