28001493 has 12 divisors (see below), whose sum is σ = 43558060. Its totient is φ = 17231616.

The previous prime is 28001473. The next prime is 28001509. The reversal of 28001493 is 39410082.

It can be written as a sum of positive squares in 2 ways, for example, as 10712529 + 17288964 = 3273^2 + 4158^2 .

It is not a de Polignac number, because 28001493 - 2⁹ = 28000981 is a prime.

It is a super-2 number, since 2×28001493² = 1568167220458098, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28001473) 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 11 ways as a sum of consecutive naturals, for example, 119548 + ... + 119781.

Almost surely, 2^28001493 is an apocalyptic number.

It is an amenable number.

28001493 is a deficient number, since it is larger than the sum of its proper divisors (15556567).

28001493 is a wasteful number, since it uses less digits than its factorization.

28001493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239348 (or 239345 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 28001493 is about 5291.6436954882. The cubic root of 28001493 is about 303.6642942670.

The spelling of 28001493 in words is "twenty-eight million, one thousand, four hundred ninety-three".