28011003 has 4 divisors (see below), whose sum is σ = 37348008. Its totient is φ = 18674000.

The previous prime is 28010971. The next prime is 28011023. The reversal of 28011003 is 30011082.

It is a happy number.

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 28011003 - 2⁵ = 28010971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28011023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4668498 + ... + 4668503.

It is an arithmetic number, because the mean of its divisors is an integer number (9337002).

Almost surely, 2^28011003 is an apocalyptic number.

28011003 is a deficient number, since it is larger than the sum of its proper divisors (9337005).

28011003 is an equidigital number, since it uses as much as digits as its factorization.

28011003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9337004.

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

The square root of 28011003 is about 5292.5422057835. The cubic root of 28011003 is about 303.6986676791.

Adding to 28011003 its reverse (30011082), we get a palindrome (58022085).

The spelling of 28011003 in words is "twenty-eight million, eleven thousand, three".