215226400 has 72 divisors (see below), whose sum is σ = 543598020. Its totient is φ = 83112960.

The previous prime is 215226391. The next prime is 215226419. The reversal of 215226400 is 4622512.

It can be written as a sum of positive squares in 6 ways, for example, as 116899344 + 98327056 = 10812^2 + 9916^2 .

It is a plaindrome in base 13.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18562 + ... + 27838.

Almost surely, 2^215226400 is an apocalyptic number.

215226400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215226400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (271799010).

215226400 is an abundant number, since it is smaller than the sum of its proper divisors (328371620).

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

215226400 is a wasteful number, since it uses less digits than its factorization.

215226400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9326 (or 9313 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 215226400 is about 14670.5964432262. The cubic root of 215226400 is about 599.2828468642.

Adding to 215226400 its reverse (4622512), we get a palindrome (219848912).

The spelling of 215226400 in words is "two hundred fifteen million, two hundred twenty-six thousand, four hundred".