28320570 has 32 divisors (see below), whose sum is σ = 75522240. Its totient is φ = 7552080.

The previous prime is 28320563. The next prime is 28320587. The reversal of 28320570 is 7502382.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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, 52176 + ... + 52715.

It is an arithmetic number, because the mean of its divisors is an integer number (2360070).

Almost surely, 2^28320570 is an apocalyptic number.

28320570 is an abundant number, since it is smaller than the sum of its proper divisors (47201670).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28320570 is a wasteful number, since it uses less digits than its factorization.

28320570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104907 (or 104901 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 28320570 is about 5321.7074327701. The cubic root of 28320570 is about 304.8133588912.

The spelling of 28320570 in words is "twenty-eight million, three hundred twenty thousand, five hundred seventy".