215720560 has 160 divisors (see below), whose sum is σ = 578534400. Its totient is φ = 74081280.

The previous prime is 215720521. The next prime is 215720567. The reversal of 215720560 is 65027512.

215720560 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215720567) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2016027 + ... + 2016133.

It is an arithmetic number, because the mean of its divisors is an integer number (3615840).

Almost surely, 2^215720560 is an apocalyptic number.

215720560 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 215720560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (289267200).

215720560 is an abundant number, since it is smaller than the sum of its proper divisors (362813840).

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

215720560 is a wasteful number, since it uses less digits than its factorization.

215720560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239 (or 233 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 215720560 is about 14687.4286381245. The cubic root of 215720560 is about 599.7411476010.

The spelling of 215720560 in words is "two hundred fifteen million, seven hundred twenty thousand, five hundred sixty".