215320064 has 40 divisors (see below), whose sum is σ = 432647160. Its totient is φ = 107053056.

The previous prime is 215320037. The next prime is 215320073. The reversal of 215320064 is 460023512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97727 + ... + 99905.

It is an arithmetic number, because the mean of its divisors is an integer number (10816179).

Almost surely, 2^215320064 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215320064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (216323580).

215320064 is an abundant number, since it is smaller than the sum of its proper divisors (217327096).

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

215320064 is an equidigital number, since it uses as much as digits as its factorization.

215320064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2390 (or 2374 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 215320064 is about 14673.7883315795. The cubic root of 215320064 is about 599.3697678739.

Adding to 215320064 its reverse (460023512), we get a palindrome (675343576).

The spelling of 215320064 in words is "two hundred fifteen million, three hundred twenty thousand, sixty-four".