28297997824 has 40 divisors (see below), whose sum is σ = 58068892728. Its totient is φ = 13766584320.

The previous prime is 28297997821. The next prime is 28297997851. The reversal of 28297997824 is 42879979282.

It is a self number, because there is not a number n which added to its sum of digits gives 28297997824.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28297997821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 727942 + ... + 765829.

Almost surely, 2^28297997824 is an apocalyptic number.

It is an amenable number.

28297997824 is an abundant number, since it is smaller than the sum of its proper divisors (29770894904).

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

28297997824 is an equidigital number, since it uses as much as digits as its factorization.

28297997824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1493826 (or 1493810 counting only the distinct ones).

The product of its digits is 73156608, while the sum is 67.

The spelling of 28297997824 in words is "twenty-eight billion, two hundred ninety-seven million, nine hundred ninety-seven thousand, eight hundred twenty-four".