28111144 has 8 divisors (see below), whose sum is σ = 52708410. Its totient is φ = 14055568.

The previous prime is 28111133. The next prime is 28111151. The reversal of 28111144 is 44111182.

It can be written as a sum of positive squares in only one way, i.e., 27688644 + 422500 = 5262^2 + 650^2 .

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

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1756939 + ... + 1756954.

Almost surely, 2^28111144 is an apocalyptic number.

It is an amenable number.

28111144 is a deficient number, since it is larger than the sum of its proper divisors (24597266).

28111144 is a wasteful number, since it uses less digits than its factorization.

28111144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3513899 (or 3513895 counting only the distinct ones).

The product of its digits is 256, while the sum is 22.

The square root of 28111144 is about 5301.9943417548. The cubic root of 28111144 is about 304.0601508399.

The spelling of 28111144 in words is "twenty-eight million, one hundred eleven thousand, one hundred forty-four".