28306443287 has 4 divisors (see below), whose sum is σ = 28306790880. Its totient is φ = 28306095696.

The previous prime is 28306443247. The next prime is 28306443301. The reversal of 28306443287 is 78234460382.

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.

It is a cyclic number.

It is not a de Polignac number, because 28306443287 - 2⁶ = 28306443223 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 (28306443227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21539 + ... + 238907.

It is an arithmetic number, because the mean of its divisors is an integer number (7076697720).

Almost surely, 2^28306443287 is an apocalyptic number.

28306443287 is a deficient number, since it is larger than the sum of its proper divisors (347593).

28306443287 is a wasteful number, since it uses less digits than its factorization.

28306443287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347592.

The product of its (nonzero) digits is 1548288, while the sum is 47.

The spelling of 28306443287 in words is "twenty-eight billion, three hundred six million, four hundred forty-three thousand, two hundred eighty-seven".