28705736 has 8 divisors (see below), whose sum is σ = 53823270. Its totient is φ = 14352864.

The previous prime is 28705727. The next prime is 28705759. The reversal of 28705736 is 63750782.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 26728900 + 1976836 = 5170^2 + 1406^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 28705736.

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 as a sum of consecutive naturals, namely, 1794101 + ... + 1794116.

Almost surely, 2^28705736 is an apocalyptic number.

It is an amenable number.

28705736 is a deficient number, since it is larger than the sum of its proper divisors (25117534).

28705736 is a wasteful number, since it uses less digits than its factorization.

28705736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3588223 (or 3588219 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 28705736 is about 5357.7734181281. The cubic root of 28705736 is about 306.1889843180.

The spelling of 28705736 in words is "twenty-eight million, seven hundred five thousand, seven hundred thirty-six".