213664755 has 32 divisors (see below), whose sum is σ = 363265344.
Its totient is φ = 106868736.
The previous prime is 213664753. The next prime is 213664811. The reversal of 213664755 is 557466312.
It is not a de Polignac number, because 213664755 - 21 = 213664753 is a prime.
It is not an unprimeable number, because it can be changed into a prime (213664753) by changing a digit.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 78477 + ... + 81153.
It is an arithmetic number, because the mean of its divisors is an integer number (11352042).
Almost surely, 2213664755 is an apocalyptic number.
213664755 is a deficient number, since it is larger than the sum of its proper divisors (149600589).
213664755 is a wasteful number, since it uses less digits than its factorization.
213664755 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 3015.
The product of its digits is 151200, while the sum is 39.
The square root of 213664755 is about 14617.2759090058.
The cubic root of 213664755 is about 597.8298966597.
The spelling of 213664755 in words is "two hundred thirteen million, six hundred sixty-four thousand, seven hundred fifty-five".