28351771 has 4 divisors (see below), whose sum is σ = 32402032. Its totient is φ = 24301512.

The previous prime is 28351769. The next prime is 28351777. The reversal of 28351771 is 17715382.

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 28351771 - 2¹ = 28351769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28351777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2025120 + ... + 2025133.

It is an arithmetic number, because the mean of its divisors is an integer number (8100508).

Almost surely, 2^28351771 is an apocalyptic number.

28351771 is a deficient number, since it is larger than the sum of its proper divisors (4050261).

28351771 is an equidigital number, since it uses as much as digits as its factorization.

28351771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4050260.

The product of its digits is 11760, while the sum is 34.

The square root of 28351771 is about 5324.6381097686. The cubic root of 28351771 is about 304.9252562525.

The spelling of 28351771 in words is "twenty-eight million, three hundred fifty-one thousand, seven hundred seventy-one".