28027784 has 8 divisors (see below), whose sum is σ = 52552110. Its totient is φ = 14013888.

The previous prime is 28027771. The next prime is 28027789. The reversal of 28027784 is 48772082.

It can be written as a sum of positive squares in only one way, i.e., 22372900 + 5654884 = 4730^2 + 2378^2 .

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

It is not an unprimeable number, because it can be changed into a prime (28027789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1751729 + ... + 1751744.

Almost surely, 2^28027784 is an apocalyptic number.

It is an amenable number.

28027784 is a deficient number, since it is larger than the sum of its proper divisors (24524326).

28027784 is a wasteful number, since it uses less digits than its factorization.

28027784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3503479 (or 3503475 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 38.

The square root of 28027784 is about 5294.1273124095. The cubic root of 28027784 is about 303.7593027798.

The spelling of 28027784 in words is "twenty-eight million, twenty-seven thousand, seven hundred eighty-four".