215440320 has 224 divisors, whose sum is σ = 743516928. Its totient is φ = 52641792.

The previous prime is 215440279. The next prime is 215440331. The reversal of 215440320 is 23044512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 701607 + ... + 701913.

It is an arithmetic number, because the mean of its divisors is an integer number (3319272).

Almost surely, 2^215440320 is an apocalyptic number.

215440320 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 215440320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (371758464).

215440320 is an abundant number, since it is smaller than the sum of its proper divisors (528076608).

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

215440320 is a wasteful number, since it uses less digits than its factorization.

215440320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387 (or 377 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 215440320 is about 14677.8854062838. The cubic root of 215440320 is about 599.4813295419.

Adding to 215440320 its reverse (23044512), we get a palindrome (238484832).

The spelling of 215440320 in words is "two hundred fifteen million, four hundred forty thousand, three hundred twenty".