28122231 has 8 divisors (see below), whose sum is σ = 37528560. Its totient is φ = 18732032.

The previous prime is 28122229. The next prime is 28122251. The reversal of 28122231 is 13222182.

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 28122231 - 2¹ = 28122229 is a prime.

It is a super-2 number, since 2×28122231² = 1581719752834722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28122198 and 28122207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28122221) 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, 901 + ... + 7553.

It is an arithmetic number, because the mean of its divisors is an integer number (4691070).

Almost surely, 2^28122231 is an apocalyptic number.

28122231 is a deficient number, since it is larger than the sum of its proper divisors (9406329).

28122231 is a wasteful number, since it uses less digits than its factorization.

28122231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8065.

The product of its digits is 384, while the sum is 21.

The square root of 28122231 is about 5303.0397886495. The cubic root of 28122231 is about 304.1001192334.

The spelling of 28122231 in words is "twenty-eight million, one hundred twenty-two thousand, two hundred thirty-one".