28455638 has 4 divisors (see below), whose sum is σ = 42683460. Its totient is φ = 14227818.

The previous prime is 28455617. The next prime is 28455643. The reversal of 28455638 is 83655482.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28455595 and 28455604.

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 as a sum of consecutive naturals, namely, 7113908 + ... + 7113911.

It is an arithmetic number, because the mean of its divisors is an integer number (10670865).

Almost surely, 2^28455638 is an apocalyptic number.

28455638 is a deficient number, since it is larger than the sum of its proper divisors (14227822).

28455638 is a wasteful number, since it uses less digits than its factorization.

28455638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14227821.

The product of its digits is 230400, while the sum is 41.

The square root of 28455638 is about 5334.3826259465. The cubic root of 28455638 is about 305.2971680414.

The spelling of 28455638 in words is "twenty-eight million, four hundred fifty-five thousand, six hundred thirty-eight".