28103949 has 16 divisors (see below), whose sum is σ = 42979840. Its totient is φ = 18131040.

The previous prime is 28103947. The next prime is 28104007. The reversal of 28103949 is 94930182.

It is not a de Polignac number, because 28103949 - 2¹ = 28103947 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28103947) 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 in 15 ways as a sum of consecutive naturals, for example, 15952 + ... + 17625.

It is an arithmetic number, because the mean of its divisors is an integer number (2686240).

Almost surely, 2^28103949 is an apocalyptic number.

It is an amenable number.

28103949 is a deficient number, since it is larger than the sum of its proper divisors (14875891).

28103949 is a wasteful number, since it uses less digits than its factorization.

28103949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33617 (or 33611 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 28103949 is about 5301.3157800682. The cubic root of 28103949 is about 304.0342073984.

The spelling of 28103949 in words is "twenty-eight million, one hundred three thousand, nine hundred forty-nine".