28103533 has 4 divisors (see below), whose sum is σ = 29756700. Its totient is φ = 26450368.

The previous prime is 28103531. The next prime is 28103557. The reversal of 28103533 is 33530182.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14722569 + 13380964 = 3837^2 + 3658^2 .

It is not a de Polignac number, because 28103533 - 2¹ = 28103531 is a prime.

It is a super-3 number, since 3×28103533³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28103498 and 28103507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28103531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 826558 + ... + 826591.

It is an arithmetic number, because the mean of its divisors is an integer number (7439175).

Almost surely, 2^28103533 is an apocalyptic number.

It is an amenable number.

28103533 is a deficient number, since it is larger than the sum of its proper divisors (1653167).

28103533 is a wasteful number, since it uses less digits than its factorization.

28103533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1653166.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 28103533 is about 5301.2765443806. The cubic root of 28103533 is about 304.0327072669.

The spelling of 28103533 in words is "twenty-eight million, one hundred three thousand, five hundred thirty-three".