215144564 has 12 divisors (see below), whose sum is σ = 378584388. Its totient is φ = 106977600.

The previous prime is 215144561. The next prime is 215144569. The reversal of 215144564 is 465441512.

215144564 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 105062500 + 110082064 = 10250^2 + 10492^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 215144564.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215144561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 147857 + ... + 149304.

It is an arithmetic number, because the mean of its divisors is an integer number (31548699).

Almost surely, 2^215144564 is an apocalyptic number.

It is an amenable number.

215144564 is a deficient number, since it is larger than the sum of its proper divisors (163439824).

215144564 is a wasteful number, since it uses less digits than its factorization.

215144564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297346 (or 297344 counting only the distinct ones).

The product of its digits is 19200, while the sum is 32.

The square root of 215144564 is about 14667.8070617253. The cubic root of 215144564 is about 599.2068816972.

The spelling of 215144564 in words is "two hundred fifteen million, one hundred forty-four thousand, five hundred sixty-four".