215120320 has 28 divisors (see below), whose sum is σ = 512256024. Its totient is φ = 86048000.

The previous prime is 215120293. The next prime is 215120327. The reversal of 215120320 is 23021512.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 215120294 and 215120303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215120327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 335806 + ... + 336445.

It is an arithmetic number, because the mean of its divisors is an integer number (18294858).

Almost surely, 2^215120320 is an apocalyptic number.

215120320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215120320 is an abundant number, since it is smaller than the sum of its proper divisors (297135704).

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

215120320 is an equidigital number, since it uses as much as digits as its factorization.

215120320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672268 (or 672258 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 215120320 is about 14666.9806027007. The cubic root of 215120320 is about 599.1843732389.

Adding to 215120320 its reverse (23021512), we get a palindrome (238141832).

The spelling of 215120320 in words is "two hundred fifteen million, one hundred twenty thousand, three hundred twenty".