215322240 has 256 divisors, whose sum is σ = 807448320. Its totient is φ = 47775744.

The previous prime is 215322223. The next prime is 215322241. The reversal of 215322240 is 42223512.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (215322241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 497064 + ... + 497496.

It is an arithmetic number, because the mean of its divisors is an integer number (3154095).

Almost surely, 2^215322240 is an apocalyptic number.

215322240 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 215322240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (403724160).

215322240 is an abundant number, since it is smaller than the sum of its proper divisors (592126080).

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

215322240 is a wasteful number, since it uses less digits than its factorization.

215322240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499 (or 487 counting only the distinct ones).

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

The square root of 215322240 is about 14673.8624772076. The cubic root of 215322240 is about 599.3717869212.

Adding to 215322240 its reverse (42223512), we get a palindrome (257545752).

The spelling of 215322240 in words is "two hundred fifteen million, three hundred twenty-two thousand, two hundred forty".