28033280778109 has 16 divisors (see below), whose sum is σ = 29413850250240. Its totient is φ = 26682535152000.

The previous prime is 28033280778073. The next prime is 28033280778133. The reversal of 28033280778109 is 90187708233082.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28033280778109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28033280778149) 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, 29564232 + ... + 30497710.

It is an arithmetic number, because the mean of its divisors is an integer number (1838365640640).

Almost surely, 2^{28033280778109} is an apocalyptic number.

It is an amenable number.

28033280778109 is a deficient number, since it is larger than the sum of its proper divisors (1380569472131).

28033280778109 is a wasteful number, since it uses less digits than its factorization.

28033280778109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 949452.

The product of its (nonzero) digits is 8128512, while the sum is 58.

The spelling of 28033280778109 in words is "twenty-eight trillion, thirty-three billion, two hundred eighty million, seven hundred seventy-eight thousand, one hundred nine".