28000422 has 12 divisors (see below), whose sum is σ = 60667620. Its totient is φ = 9333468.

The previous prime is 28000421. The next prime is 28000451. The reversal of 28000422 is 22400082.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1555579 = 28000422 / (2 + 8 + 0 + 0 + 0 + 4 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 28000395 and 28000404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28000421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 777772 + ... + 777807.

It is an arithmetic number, because the mean of its divisors is an integer number (5055635).

Almost surely, 2^28000422 is an apocalyptic number.

28000422 is an abundant number, since it is smaller than the sum of its proper divisors (32667198).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28000422 is a wasteful number, since it uses less digits than its factorization.

28000422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1555587 (or 1555584 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 28000422 is about 5291.5424972308. The cubic root of 28000422 is about 303.6604227044.

The spelling of 28000422 in words is "twenty-eight million, four hundred twenty-two", and thus it is an aban number.