215422164 has 72 divisors (see below), whose sum is σ = 581188608. Its totient is φ = 67042560.

The previous prime is 215422153. The next prime is 215422201. The reversal of 215422164 is 461224512.

215422164 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 an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78829 + ... + 81515.

It is an arithmetic number, because the mean of its divisors is an integer number (8072064).

Almost surely, 2^215422164 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215422164, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (290594304).

215422164 is an abundant number, since it is smaller than the sum of its proper divisors (365766444).

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

215422164 is a wasteful number, since it uses less digits than its factorization.

215422164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2845 (or 2840 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 215422164 is about 14677.2669117925. The cubic root of 215422164 is about 599.4644888552.

Adding to 215422164 its reverse (461224512), we get a palindrome (676646676).

The spelling of 215422164 in words is "two hundred fifteen million, four hundred twenty-two thousand, one hundred sixty-four".