213664770 has 64 divisors (see below), whose sum is σ = 621578880. Its totient is φ = 51796800.

The previous prime is 213664753. The next prime is 213664811. The reversal of 213664770 is 77466312.

213664770 is a `hidden beast` number, since 2 + 1 + 3 + 6 + 647 + 7 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33001 + ... + 38940.

It is an arithmetic number, because the mean of its divisors is an integer number (9712170).

Almost surely, 2^213664770 is an apocalyptic number.

213664770 is an abundant number, since it is smaller than the sum of its proper divisors (407914110).

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

213664770 is a wasteful number, since it uses less digits than its factorization.

213664770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71968 (or 71962 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 36.

The square root of 213664770 is about 14617.2764220972. The cubic root of 213664770 is about 597.8299106496.

The spelling of 213664770 in words is "two hundred thirteen million, six hundred sixty-four thousand, seven hundred seventy".