28223711 has 8 divisors (see below), whose sum is σ = 29261520. Its totient is φ = 27200448.

The previous prime is 28223687. The next prime is 28223717. The reversal of 28223711 is 11732282.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28223711 - 2⁶ = 28223647 is a prime.

It is a super-2 number, since 2×28223711² = 1593155725223042, which 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 (28223717) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 395 + ... + 7523.

It is an arithmetic number, because the mean of its divisors is an integer number (3657690).

Almost surely, 2^28223711 is an apocalyptic number.

28223711 is a deficient number, since it is larger than the sum of its proper divisors (1037809).

28223711 is a wasteful number, since it uses less digits than its factorization.

28223711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7273.

The product of its digits is 1344, while the sum is 26.

The square root of 28223711 is about 5312.5992696608. The cubic root of 28223711 is about 304.4654652411.

Adding to 28223711 its reverse (11732282), we get a palindrome (39955993).

The spelling of 28223711 in words is "twenty-eight million, two hundred twenty-three thousand, seven hundred eleven".