28723223 has 4 divisors (see below), whose sum is σ = 28750368. Its totient is φ = 28696080.

The previous prime is 28723207. The next prime is 28723249. The reversal of 28723223 is 32232782.

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 28723223 - 2⁴ = 28723207 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 (28723423) 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, 11918 + ... + 14123.

It is an arithmetic number, because the mean of its divisors is an integer number (7187592).

Almost surely, 2^28723223 is an apocalyptic number.

28723223 is a deficient number, since it is larger than the sum of its proper divisors (27145).

28723223 is a wasteful number, since it uses less digits than its factorization.

28723223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27144.

The product of its digits is 8064, while the sum is 29.

The square root of 28723223 is about 5359.4050975831. The cubic root of 28723223 is about 306.2511465735.

The spelling of 28723223 in words is "twenty-eight million, seven hundred twenty-three thousand, two hundred twenty-three".