28381622 has 4 divisors (see below), whose sum is σ = 42572436. Its totient is φ = 14190810.

The previous prime is 28381621. The next prime is 28381631. The reversal of 28381622 is 22618382.

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 (28381621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7095404 + ... + 7095407.

It is an arithmetic number, because the mean of its divisors is an integer number (10643109).

Almost surely, 2^28381622 is an apocalyptic number.

28381622 is a deficient number, since it is larger than the sum of its proper divisors (14190814).

28381622 is a wasteful number, since it uses less digits than its factorization.

28381622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14190813.

The product of its digits is 9216, while the sum is 32.

The square root of 28381622 is about 5327.4404736233. The cubic root of 28381622 is about 305.0322352385.

The spelling of 28381622 in words is "twenty-eight million, three hundred eighty-one thousand, six hundred twenty-two".