28320770 has 8 divisors (see below), whose sum is σ = 50977404. Its totient is φ = 11328304.

The previous prime is 28320769. The next prime is 28320821. The reversal of 28320770 is 7702382.

It can be written as a sum of positive squares in 2 ways, for example, as 27867841 + 452929 = 5279^2 + 673^2 .

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 (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1416029 + ... + 1416048.

Almost surely, 2^28320770 is an apocalyptic number.

28320770 is a deficient number, since it is larger than the sum of its proper divisors (22656634).

28320770 is a wasteful number, since it uses less digits than its factorization.

28320770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2832084.

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 28320770 is about 5321.7262236985. The cubic root of 28320770 is about 304.8140764207.

The spelling of 28320770 in words is "twenty-eight million, three hundred twenty thousand, seven hundred seventy".