28912103 has 6 divisors (see below), whose sum is σ = 31779552. Its totient is φ = 26283620.

The previous prime is 28912099. The next prime is 28912151. The reversal of 28912103 is 30121982.

It is not a de Polignac number, because 28912103 - 2² = 28912099 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 (28912193) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 119351 + ... + 119592.

It is an arithmetic number, because the mean of its divisors is an integer number (5296592).

Almost surely, 2^28912103 is an apocalyptic number.

28912103 is a deficient number, since it is larger than the sum of its proper divisors (2867449).

28912103 is a wasteful number, since it uses less digits than its factorization.

28912103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238965 (or 238954 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 28912103 is about 5376.9975822944. The cubic root of 28912103 is about 306.9209690926.

Adding to 28912103 its sum of digits (26), we get a square (28912129 = 5377²).

It can be divided in two parts, 2891 and 2103, that added together give a palindrome (4994).

The spelling of 28912103 in words is "twenty-eight million, nine hundred twelve thousand, one hundred three".