28288777391 has 8 divisors (see below), whose sum is σ = 32471212320. Its totient is φ = 24141637728.

The previous prime is 28288777381. The next prime is 28288777397. The reversal of 28288777391 is 19377788282.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28288777391 - 2¹⁰ = 28288776367 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 (28288777397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8822096 + ... + 8825301.

It is an arithmetic number, because the mean of its divisors is an integer number (4058901540).

Almost surely, 2^28288777391 is an apocalyptic number.

28288777391 is a deficient number, since it is larger than the sum of its proper divisors (4182434929).

28288777391 is a wasteful number, since it uses less digits than its factorization.

28288777391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17647633.

The product of its digits is 18966528, while the sum is 62.

The spelling of 28288777391 in words is "twenty-eight billion, two hundred eighty-eight million, seven hundred seventy-seven thousand, three hundred ninety-one".