28693223 has 4 divisors (see below), whose sum is σ = 30900408. Its totient is φ = 26486040.

The previous prime is 28693199. The next prime is 28693243. The reversal of 28693223 is 32239682.

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 28693223 - 2⁸ = 28692967 is a prime.

It is a super-2 number, since 2×28693223² = 1646602092255458, 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 (28693243) 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, 1103573 + ... + 1103598.

It is an arithmetic number, because the mean of its divisors is an integer number (7725102).

Almost surely, 2^28693223 is an apocalyptic number.

28693223 is a deficient number, since it is larger than the sum of its proper divisors (2207185).

28693223 is a wasteful number, since it uses less digits than its factorization.

28693223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2207184.

The product of its digits is 31104, while the sum is 35.

The square root of 28693223 is about 5356.6055482927. The cubic root of 28693223 is about 306.1444879893.

The spelling of 28693223 in words is "twenty-eight million, six hundred ninety-three thousand, two hundred twenty-three".