215245320 has 64 divisors (see below), whose sum is σ = 648872640. Its totient is φ = 57120000.

The previous prime is 215245297. The next prime is 215245363. The reversal of 215245320 is 23542512.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 21070 + ... + 29570.

It is an arithmetic number, because the mean of its divisors is an integer number (10138635).

Almost surely, 2^215245320 is an apocalyptic number.

215245320 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 215245320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (324436320).

215245320 is an abundant number, since it is smaller than the sum of its proper divisors (433627320).

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

215245320 is a wasteful number, since it uses less digits than its factorization.

215245320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8726 (or 8722 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 215245320 is about 14671.2412562809. The cubic root of 215245320 is about 599.3004068216.

Adding to 215245320 its reverse (23542512), we get a palindrome (238787832).

The spelling of 215245320 in words is "two hundred fifteen million, two hundred forty-five thousand, three hundred twenty".