28005622 has 4 divisors (see below), whose sum is σ = 42008436. Its totient is φ = 14002810.

The previous prime is 28005569. The next prime is 28005623. The reversal of 28005622 is 22650082.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28005623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7001404 + ... + 7001407.

It is an arithmetic number, because the mean of its divisors is an integer number (10502109).

Almost surely, 2^28005622 is an apocalyptic number.

28005622 is a deficient number, since it is larger than the sum of its proper divisors (14002814).

28005622 is a wasteful number, since it uses less digits than its factorization.

28005622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14002813.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 28005622 is about 5292.0338245329. The cubic root of 28005622 is about 303.6792192837.

The spelling of 28005622 in words is "twenty-eight million, five thousand, six hundred twenty-two".