215223240 has 64 divisors (see below), whose sum is σ = 648596160. Its totient is φ = 57132800.

The previous prime is 215223221. The next prime is 215223277. The reversal of 215223240 is 42322512.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23290 + ... + 31190.

It is an arithmetic number, because the mean of its divisors is an integer number (10134315).

Almost surely, 2^215223240 is an apocalyptic number.

215223240 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 215223240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (324298080).

215223240 is an abundant number, since it is smaller than the sum of its proper divisors (433372920).

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

215223240 is a wasteful number, since it uses less digits than its factorization.

215223240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8142 (or 8138 counting only the distinct ones).

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

The square root of 215223240 is about 14670.4887444148. The cubic root of 215223240 is about 599.2799139169.

Adding to 215223240 its reverse (42322512), we get a palindrome (257545752).

The spelling of 215223240 in words is "two hundred fifteen million, two hundred twenty-three thousand, two hundred forty".