211073864 has 8 divisors (see below), whose sum is σ = 395763510. Its totient is φ = 105536928.

The previous prime is 211073839. The next prime is 211073867. The reversal of 211073864 is 468370112.

It can be written as a sum of positive squares in only one way, i.e., 198528100 + 12545764 = 14090^2 + 3542^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 211073864.

It is not an unprimeable number, because it can be changed into a prime (211073867) 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 as a sum of consecutive naturals, namely, 13192109 + ... + 13192124.

Almost surely, 2^211073864 is an apocalyptic number.

It is an amenable number.

211073864 is a deficient number, since it is larger than the sum of its proper divisors (184689646).

211073864 is a wasteful number, since it uses less digits than its factorization.

211073864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26384239 (or 26384235 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 211073864 is about 14528.3813275946. The cubic root of 211073864 is about 595.4036420307.

The spelling of 211073864 in words is "two hundred eleven million, seventy-three thousand, eight hundred sixty-four".