28001403 has 8 divisors (see below), whose sum is σ = 41483600. Its totient is φ = 18667584.

The previous prime is 28001399. The next prime is 28001417. The reversal of 28001403 is 30410082.

It is a happy number.

It is not a de Polignac number, because 28001403 - 2² = 28001399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28001473) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 518518 + ... + 518571.

It is an arithmetic number, because the mean of its divisors is an integer number (5185450).

Almost surely, 2^28001403 is an apocalyptic number.

28001403 is a deficient number, since it is larger than the sum of its proper divisors (13482197).

28001403 is a wasteful number, since it uses less digits than its factorization.

28001403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1037098 (or 1037092 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 28001403 is about 5291.6351915074. The cubic root of 28001403 is about 303.6639689294.

Adding to 28001403 its reverse (30410082), we get a palindrome (58411485).

The spelling of 28001403 in words is "twenty-eight million, one thousand, four hundred three".