28643222 has 16 divisors (see below), whose sum is σ = 45489600. Its totient is φ = 13488840.

The previous prime is 28643207. The next prime is 28643233. The reversal of 28643222 is 22234682.

28643222 is a modest number, since divided by 3222 gives 2864 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4697 + ... + 8907.

It is an arithmetic number, because the mean of its divisors is an integer number (2843100).

Almost surely, 2^28643222 is an apocalyptic number.

28643222 is a deficient number, since it is larger than the sum of its proper divisors (16846378).

28643222 is a wasteful number, since it uses less digits than its factorization.

28643222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4411.

The product of its digits is 9216, while the sum is 29.

The square root of 28643222 is about 5351.9362851215. The cubic root of 28643222 is about 305.9665547908.

The spelling of 28643222 in words is "twenty-eight million, six hundred forty-three thousand, two hundred twenty-two".