28704770 has 16 divisors (see below), whose sum is σ = 52516728. Its totient is φ = 11293440.

The previous prime is 28704769. The next prime is 28704799. The reversal of 28704770 is 7740782.

It can be written as a sum of positive squares in 4 ways, for example, as 7091569 + 21613201 = 2663^2 + 4649^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28704770.

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 7 ways as a sum of consecutive naturals, for example, 22919 + ... + 24138.

Almost surely, 2^28704770 is an apocalyptic number.

28704770 is a deficient number, since it is larger than the sum of its proper divisors (23811958).

28704770 is a wasteful number, since it uses less digits than its factorization.

28704770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47125.

The product of its (nonzero) digits is 21952, while the sum is 35.

The square root of 28704770 is about 5357.6832679807. The cubic root of 28704770 is about 306.1855496749.

The spelling of 28704770 in words is "twenty-eight million, seven hundred four thousand, seven hundred seventy".