213670656 has 144 divisors (see below), whose sum is σ = 665526400. Its totient is φ = 67433472.

The previous prime is 213670649. The next prime is 213670673. The reversal of 213670656 is 656076312.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 213670656.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130515 + ... + 132141.

Almost surely, 2^213670656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 213670656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (332763200).

213670656 is an abundant number, since it is smaller than the sum of its proper divisors (451855744).

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

213670656 is a wasteful number, since it uses less digits than its factorization.

213670656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1671 (or 1651 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 213670656 is about 14617.4777578076. The cubic root of 213670656 is about 597.8354002374.

The spelling of 213670656 in words is "two hundred thirteen million, six hundred seventy thousand, six hundred fifty-six".