213664810 has 32 divisors (see below), whose sum is σ = 391184640. Its totient is φ = 84014592.

The previous prime is 213664753. The next prime is 213664811. The reversal of 213664810 is 18466312.

It is a happy number.

It is a super-2 number, since 2×213664810² = 91305302064672200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (213664811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161331 + ... + 162649.

It is an arithmetic number, because the mean of its divisors is an integer number (12224520).

Almost surely, 2^213664810 is an apocalyptic number.

213664810 is a deficient number, since it is larger than the sum of its proper divisors (177519830).

213664810 is a wasteful number, since it uses less digits than its factorization.

213664810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1590.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 213664810 is about 14617.2777903411. The cubic root of 213664810 is about 597.8299479560.

The spelling of 213664810 in words is "two hundred thirteen million, six hundred sixty-four thousand, eight hundred ten".