28730906 has 8 divisors (see below), whose sum is σ = 43221600. Its totient is φ = 14323708.

The previous prime is 28730881. The next prime is 28730917. The reversal of 28730906 is 60903782.

It is a sphenic number, since it is the product of 3 distinct primes.

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 in 3 ways as a sum of consecutive naturals, for example, 20006 + ... + 21393.

It is an arithmetic number, because the mean of its divisors is an integer number (5402700).

Almost surely, 2^28730906 is an apocalyptic number.

28730906 is a deficient number, since it is larger than the sum of its proper divisors (14490694).

28730906 is a wasteful number, since it uses less digits than its factorization.

28730906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41748.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 28730906 is about 5360.1218269737. The cubic root of 28730906 is about 306.2784498907.

The spelling of 28730906 in words is "twenty-eight million, seven hundred thirty thousand, nine hundred six".