28204120400 has 30 divisors (see below), whose sum is σ = 67760400222. Its totient is φ = 11281648000.

The previous prime is 28204120379. The next prime is 28204120421. The reversal of 28204120400 is 402140282.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28204120379) and next prime (28204120421).

It can be written as a sum of positive squares in 3 ways, for example, as 3825669904 + 24378450496 = 61852^2 + 156136^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35254751 + ... + 35255550.

Almost surely, 2^28204120400 is an apocalyptic number.

28204120400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28204120400 is an abundant number, since it is smaller than the sum of its proper divisors (39556279822).

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

28204120400 is a wasteful number, since it uses less digits than its factorization.

28204120400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70510319 (or 70510308 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 28204120400 its reverse (402140282), we get a palindrome (28606260682).

The spelling of 28204120400 in words is "twenty-eight billion, two hundred four million, one hundred twenty thousand, four hundred".