213664446 has 16 divisors (see below), whose sum is σ = 474810000. Its totient is φ = 71221464.

The previous prime is 213664433. The next prime is 213664453. The reversal of 213664446 is 644466312.

213664446 is a `hidden beast` number, since 2 + 1 + 3 + 6 + 644 + 4 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 213664446.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1978321 + ... + 1978428.

It is an arithmetic number, because the mean of its divisors is an integer number (29675625).

Almost surely, 2^213664446 is an apocalyptic number.

213664446 is an abundant number, since it is smaller than the sum of its proper divisors (261145554).

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

213664446 is a wasteful number, since it uses less digits than its factorization.

213664446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3956760 (or 3956754 counting only the distinct ones).

The product of its digits is 82944, while the sum is 36.

The square root of 213664446 is about 14617.2653393171. The cubic root of 213664446 is about 597.8296084675.

The spelling of 213664446 in words is "two hundred thirteen million, six hundred sixty-four thousand, four hundred forty-six".