28772103 has 16 divisors (see below), whose sum is σ = 40158720. Its totient is φ = 18288864.

The previous prime is 28772077. The next prime is 28772141. The reversal of 28772103 is 30127782.

It is not a de Polignac number, because 28772103 - 2⁹ = 28771591 is a prime.

It is a super-2 number, since 2×28772103² = 1655667822085218, which contains 22 as substring.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28772153) 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, 34293 + ... + 35121.

It is an arithmetic number, because the mean of its divisors is an integer number (2509920).

Almost surely, 2^28772103 is an apocalyptic number.

28772103 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

28772103 is a deficient number, since it is larger than the sum of its proper divisors (11386617).

28772103 is a wasteful number, since it uses less digits than its factorization.

28772103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1358.

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 28772103 is about 5363.9633667653. The cubic root of 28772103 is about 306.4247699924.

Adding to 28772103 its reverse (30127782), we get a palindrome (58899885).

It can be divided in two parts, 287 and 72103, that added together give a triangular number (72390 = T₃₈₀).

The spelling of 28772103 in words is "twenty-eight million, seven hundred seventy-two thousand, one hundred three".