215871320 has 128 divisors (see below), whose sum is σ = 580469760. Its totient is φ = 70709760.

The previous prime is 215871317. The next prime is 215871361. The reversal of 215871320 is 23178512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 693965 + ... + 694275.

It is an arithmetic number, because the mean of its divisors is an integer number (4534920).

Almost surely, 2^215871320 is an apocalyptic number.

215871320 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 215871320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (290234880).

215871320 is an abundant number, since it is smaller than the sum of its proper divisors (364598440).

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

215871320 is a wasteful number, since it uses less digits than its factorization.

215871320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433 (or 429 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 215871320 is about 14692.5600219975. The cubic root of 215871320 is about 599.8808281835.

The spelling of 215871320 in words is "two hundred fifteen million, eight hundred seventy-one thousand, three hundred twenty".