28305951 has 8 divisors (see below), whose sum is σ = 37810560. Its totient is φ = 18835992.

The previous prime is 28305947. The next prime is 28305971. The reversal of 28305951 is 15950382.

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

It is not a de Polignac number, because 28305951 - 2² = 28305947 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28305971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6691 + ... + 10068.

It is an arithmetic number, because the mean of its divisors is an integer number (4726320).

Almost surely, 2^28305951 is an apocalyptic number.

28305951 is a deficient number, since it is larger than the sum of its proper divisors (9504609).

28305951 is a wasteful number, since it uses less digits than its factorization.

28305951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17325.

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 28305951 is about 5320.3337301339. Note that the first 3 decimals coincide. The cubic root of 28305951 is about 304.7609019262.

The spelling of 28305951 in words is "twenty-eight million, three hundred five thousand, nine hundred fifty-one".