28709834 has 4 divisors (see below), whose sum is σ = 43064754. Its totient is φ = 14354916.

The previous prime is 28709801. The next prime is 28709851. The reversal of 28709834 is 43890782.

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

It can be written as a sum of positive squares in only one way, i.e., 28654609 + 55225 = 5353^2 + 235^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28709791 and 28709800.

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, 7177457 + ... + 7177460.

Almost surely, 2^28709834 is an apocalyptic number.

28709834 is a deficient number, since it is larger than the sum of its proper divisors (14354920).

28709834 is a wasteful number, since it uses less digits than its factorization.

28709834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14354919.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 28709834 is about 5358.1558394657. The cubic root of 28709834 is about 306.2035540281.

The spelling of 28709834 in words is "twenty-eight million, seven hundred nine thousand, eight hundred thirty-four".