28493638 has 4 divisors (see below), whose sum is σ = 42740460. Its totient is φ = 14246818.

The previous prime is 28493629. The next prime is 28493657. The reversal of 28493638 is 83639482.

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

It is a junction number, because it is equal to n+sod(n) for n = 28493594 and 28493603.

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, 7123408 + ... + 7123411.

It is an arithmetic number, because the mean of its divisors is an integer number (10685115).

Almost surely, 2^28493638 is an apocalyptic number.

28493638 is a deficient number, since it is larger than the sum of its proper divisors (14246822).

28493638 is a wasteful number, since it uses less digits than its factorization.

28493638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14246821.

The product of its digits is 248832, while the sum is 43.

The square root of 28493638 is about 5337.9432368657. The cubic root of 28493638 is about 305.4330067581.

The spelling of 28493638 in words is "twenty-eight million, four hundred ninety-three thousand, six hundred thirty-eight".