215325440 has 144 divisors (see below), whose sum is σ = 577928736. Its totient is φ = 76185600.

The previous prime is 215325433. The next prime is 215325449. The reversal of 215325440 is 44523512.

It is a happy number.

It is a super-2 number, since 2×215325440² = 92730090222387200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (215325449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 577094 + ... + 577466.

It is an arithmetic number, because the mean of its divisors is an integer number (4013394).

Almost surely, 2^215325440 is an apocalyptic number.

215325440 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 215325440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (288964368).

215325440 is an abundant number, since it is smaller than the sum of its proper divisors (362603296).

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

215325440 is a wasteful number, since it uses less digits than its factorization.

215325440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446 (or 432 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 215325440 is about 14673.9715142152. The cubic root of 215325440 is about 599.3747560838.

Adding to 215325440 its reverse (44523512), we get a palindrome (259848952).

The spelling of 215325440 in words is "two hundred fifteen million, three hundred twenty-five thousand, four hundred forty".