28042240404 has 24 divisors (see below), whose sum is σ = 65703402688. Its totient is φ = 9308626560.

The previous prime is 28042240397. The next prime is 28042240409. The reversal of 28042240404 is 40404224082.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28042240409) 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, 4845352 + ... + 4851135.

Almost surely, 2^28042240404 is an apocalyptic number.

It is an amenable number.

28042240404 is an abundant number, since it is smaller than the sum of its proper divisors (37661162284).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28042240404 is a wasteful number, since it uses less digits than its factorization.

28042240404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9696735 (or 9696733 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 30.

Adding to 28042240404 its reverse (40404224082), we get a palindrome (68446464486).

The spelling of 28042240404 in words is "twenty-eight billion, forty-two million, two hundred forty thousand, four hundred four".