28440248413 has 4 divisors (see below), whose sum is σ = 30113204220. Its totient is φ = 26767292608.

The previous prime is 28440248399. The next prime is 28440248437. The reversal of 28440248413 is 31484204482.

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 10601173444 + 17839074969 = 102962^2 + 133563^2 .

It is not a de Polignac number, because 28440248413 - 2⁵ = 28440248381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28440248453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 836477878 + ... + 836477911.

It is an arithmetic number, because the mean of its divisors is an integer number (7528301055).

Almost surely, 2^28440248413 is an apocalyptic number.

It is an amenable number.

28440248413 is a deficient number, since it is larger than the sum of its proper divisors (1672955807).

28440248413 is a wasteful number, since it uses less digits than its factorization.

28440248413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1672955806.

The product of its (nonzero) digits is 196608, while the sum is 40.

The spelling of 28440248413 in words is "twenty-eight billion, four hundred forty million, two hundred forty-eight thousand, four hundred thirteen".