213643632 has 20 divisors (see below), whose sum is σ = 551912840. Its totient is φ = 71214528.

The previous prime is 213643631. The next prime is 213643649. The reversal of 213643632 is 236346312.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 213643632.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213643631) 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, 2225407 + ... + 2225502.

It is an arithmetic number, because the mean of its divisors is an integer number (27595642).

Almost surely, 2^213643632 is an apocalyptic number.

It is an amenable number.

213643632 is an abundant number, since it is smaller than the sum of its proper divisors (338269208).

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

213643632 is a wasteful number, since it uses less digits than its factorization.

213643632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4450920 (or 4450914 counting only the distinct ones).

The product of its digits is 15552, while the sum is 30.

The square root of 213643632 is about 14616.5533556991. The cubic root of 213643632 is about 597.8101954272.

Adding to 213643632 its reverse (236346312), we get a palindrome (449989944).

The spelling of 213643632 in words is "two hundred thirteen million, six hundred forty-three thousand, six hundred thirty-two".