28399260591 has 24 divisors (see below), whose sum is σ = 44781800336. Its totient is φ = 17237059200.

The previous prime is 28399260583. The next prime is 28399260607. The reversal of 28399260591 is 19506299382.

It is a happy number.

28399260591 is a `hidden beast` number, since 28 + 3 + 9 + 9 + 2 + 605 + 9 + 1 = 666.

It is not a de Polignac number, because 28399260591 - 2³ = 28399260583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28399260091) 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, 1653985 + ... + 1671066.

Almost surely, 2^28399260591 is an apocalyptic number.

28399260591 is a deficient number, since it is larger than the sum of its proper divisors (16382539745).

28399260591 is a wasteful number, since it uses less digits than its factorization.

28399260591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3325143 (or 3325140 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 54.

The spelling of 28399260591 in words is "twenty-eight billion, three hundred ninety-nine million, two hundred sixty thousand, five hundred ninety-one".