28038784 has 16 divisors (see below), whose sum is σ = 55858770. Its totient is φ = 14019328.

The previous prime is 28038757. The next prime is 28038809. The reversal of 28038784 is 48783082.

It can be written as a sum of positive squares in only one way, i.e., 26296384 + 1742400 = 5128^2 + 1320^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109399 + ... + 109654.

Almost surely, 2^28038784 is an apocalyptic number.

It is an amenable number.

28038784 is a deficient number, since it is larger than the sum of its proper divisors (27819986).

28038784 is an equidigital number, since it uses as much as digits as its factorization.

28038784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219067 (or 219055 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 40.

The square root of 28038784 is about 5295.1660974893. The cubic root of 28038784 is about 303.7990361541.

The spelling of 28038784 in words is "twenty-eight million, thirty-eight thousand, seven hundred eighty-four".