28000003 has 4 divisors (see below), whose sum is σ = 29647080. Its totient is φ = 26352928.

The previous prime is 27999943. The next prime is 28000019. The reversal of 28000003 is 30000082.

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

It is a cyclic number.

It is not a de Polignac number, because 28000003 - 2¹³ = 27991811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28000073) 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, 823513 + ... + 823546.

It is an arithmetic number, because the mean of its divisors is an integer number (7411770).

Almost surely, 2^28000003 is an apocalyptic number.

28000003 is a deficient number, since it is larger than the sum of its proper divisors (1647077).

28000003 is a wasteful number, since it uses less digits than its factorization.

28000003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1647076.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 28000003 is about 5291.5029056025. The cubic root of 28000003 is about 303.6589080325.

Adding to 28000003 its reverse (30000082), we get a palindrome (58000085).

The spelling of 28000003 in words is "twenty-eight million, three", and thus it is an aban number and an uban number.