28648222 has 8 divisors (see below), whose sum is σ = 43041096. Its totient is φ = 14301192.

The previous prime is 28648199. The next prime is 28648237. The reversal of 28648222 is 22284682.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×28648222² = 1641441247522568, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9853 + ... + 12424.

It is an arithmetic number, because the mean of its divisors is an integer number (5380137).

Almost surely, 2^28648222 is an apocalyptic number.

28648222 is a deficient number, since it is larger than the sum of its proper divisors (14392874).

28648222 is a wasteful number, since it uses less digits than its factorization.

28648222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22922.

The product of its digits is 24576, while the sum is 34.

The square root of 28648222 is about 5352.4033853961. The cubic root of 28648222 is about 305.9843570684.

The spelling of 28648222 in words is "twenty-eight million, six hundred forty-eight thousand, two hundred twenty-two".