28266220400 has 60 divisors (see below), whose sum is σ = 74083205544. Its totient is φ = 10278624000.

The previous prime is 28266220387. The next prime is 28266220403. The reversal of 28266220400 is 402266282.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28266220403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3207671 + ... + 3216470.

Almost surely, 2^28266220400 is an apocalyptic number.

28266220400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28266220400 is an abundant number, since it is smaller than the sum of its proper divisors (45816985144).

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

28266220400 is a wasteful number, since it uses less digits than its factorization.

28266220400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6424170 (or 6424159 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 32.

Adding to 28266220400 its reverse (402266282), we get a palindrome (28668486682).

It can be divided in two parts, 2826 and 6220400, that added together give a palindrome (6223226).

The spelling of 28266220400 in words is "twenty-eight billion, two hundred sixty-six million, two hundred twenty thousand, four hundred".