28287017431 has 4 divisors (see below), whose sum is σ = 28287367000. Its totient is φ = 28286667864.

The previous prime is 28287017399. The next prime is 28287017453. The reversal of 28287017431 is 13471078282.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 13471078282 = 2 ⋅6735539141.

It is a cyclic number.

It is not a de Polignac number, because 28287017431 - 2⁵ = 28287017399 is a prime.

It is a super-2 number, since 2×28287017431² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28287012431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16045 + ... + 238393.

It is an arithmetic number, because the mean of its divisors is an integer number (7071841750).

Almost surely, 2^28287017431 is an apocalyptic number.

28287017431 is a deficient number, since it is larger than the sum of its proper divisors (349569).

28287017431 is a wasteful number, since it uses less digits than its factorization.

28287017431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349568.

The product of its (nonzero) digits is 150528, while the sum is 43.

The spelling of 28287017431 in words is "twenty-eight billion, two hundred eighty-seven million, seventeen thousand, four hundred thirty-one".