28214231 has 8 divisors (see below), whose sum is σ = 28495584. Its totient is φ = 27934720.

The previous prime is 28214201. The next prime is 28214233. The reversal of 28214231 is 13241282.

It is a happy number.

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 28214231 - 2⁶ = 28214167 is a prime.

It is a super-2 number, since 2×28214231² = 1592085661842722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28214197 and 28214206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28214233) 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, 79751 + ... + 80103.

It is an arithmetic number, because the mean of its divisors is an integer number (3561948).

Almost surely, 2^28214231 is an apocalyptic number.

28214231 is a deficient number, since it is larger than the sum of its proper divisors (281353).

28214231 is a wasteful number, since it uses less digits than its factorization.

28214231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 921.

The product of its digits is 768, while the sum is 23.

The square root of 28214231 is about 5311.7069761048. The cubic root of 28214231 is about 304.4313726793.

The spelling of 28214231 in words is "twenty-eight million, two hundred fourteen thousand, two hundred thirty-one".