28305600031 has 4 divisors (see below), whose sum is σ = 28306790064. Its totient is φ = 28304410000.

The previous prime is 28305600007. The next prime is 28305600061. The reversal of 28305600031 is 13000650382.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28305600031 - 2⁹ = 28305599519 is a prime.

It is a super-2 number, since 2×28305600031² (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 (28305600061) 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 3 ways as a sum of consecutive naturals, for example, 558595 + ... + 607156.

It is an arithmetic number, because the mean of its divisors is an integer number (7076697516).

Almost surely, 2^28305600031 is an apocalyptic number.

28305600031 is a deficient number, since it is larger than the sum of its proper divisors (1190033).

28305600031 is a wasteful number, since it uses less digits than its factorization.

28305600031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1190032.

The product of its (nonzero) digits is 4320, while the sum is 28.

The spelling of 28305600031 in words is "twenty-eight billion, three hundred five million, six hundred thousand, thirty-one".