28201229 has 4 divisors (see below), whose sum is σ = 32229984. Its totient is φ = 24172476.

The previous prime is 28201223. The next prime is 28201231. The reversal of 28201229 is 92210282.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28201229 - 2⁸ = 28200973 is a prime.

It is a super-2 number, since 2×28201229² = 1590618634220882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28201198 and 28201207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28201223) 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, 2014367 + ... + 2014380.

It is an arithmetic number, because the mean of its divisors is an integer number (8057496).

Almost surely, 2^28201229 is an apocalyptic number.

It is an amenable number.

28201229 is a deficient number, since it is larger than the sum of its proper divisors (4028755).

28201229 is an equidigital number, since it uses as much as digits as its factorization.

28201229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4028754.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 28201229 is about 5310.4829347245. The cubic root of 28201229 is about 304.3846016617.

The spelling of 28201229 in words is "twenty-eight million, two hundred one thousand, two hundred twenty-nine".