28320651 has 16 divisors (see below), whose sum is σ = 43092000. Its totient is φ = 18369504.

The previous prime is 28320647. The next prime is 28320661. The reversal of 28320651 is 15602382.

28320651 is a `hidden beast` number, since 2 + 8 + 3 + 2 + 0 + 651 = 666.

It is not a de Polignac number, because 28320651 - 2² = 28320647 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28320641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13176 + ... + 15173.

It is an arithmetic number, because the mean of its divisors is an integer number (2693250).

Almost surely, 2^28320651 is an apocalyptic number.

28320651 is a deficient number, since it is larger than the sum of its proper divisors (14771349).

28320651 is a wasteful number, since it uses less digits than its factorization.

28320651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28395 (or 28389 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 28320651 is about 5321.7150431041. The cubic root of 28320651 is about 304.8136494910.

The spelling of 28320651 in words is "twenty-eight million, three hundred twenty thousand, six hundred fifty-one".