28103001 has 16 divisors (see below), whose sum is σ = 38923200. Its totient is φ = 18014528.

The previous prime is 28102973. The next prime is 28103003. The reversal of 28103001 is 10030182.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 28103001 - 2¹⁷ = 27971929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28103003) 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, 27070 + ... + 28088.

It is an arithmetic number, because the mean of its divisors is an integer number (2432700).

Almost surely, 2^28103001 is an apocalyptic number.

It is an amenable number.

28103001 is a deficient number, since it is larger than the sum of its proper divisors (10820199).

28103001 is a wasteful number, since it uses less digits than its factorization.

28103001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1368.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 28103001 is about 5301.2263675493. The cubic root of 28103001 is about 304.0307888080.

Adding to 28103001 its reverse (10030182), we get a palindrome (38133183).

The spelling of 28103001 in words is "twenty-eight million, one hundred three thousand, one".