213740656 has 40 divisors (see below), whose sum is σ = 436400640. Its totient is φ = 101213376.

The previous prime is 213740627. The next prime is 213740663. The reversal of 213740656 is 656047312.

It is a happy number.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

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, 35085 + ... + 40723.

It is an arithmetic number, because the mean of its divisors is an integer number (10910016).

Almost surely, 2^213740656 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 213740656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (218200320).

213740656 is an abundant number, since it is smaller than the sum of its proper divisors (222659984).

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

213740656 is a wasteful number, since it uses less digits than its factorization.

213740656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5773 (or 5767 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 213740656 is about 14619.8719556636. The cubic root of 213740656 is about 597.9006781276.

Adding to 213740656 its reverse (656047312), we get a palindrome (869787968).

The spelling of 213740656 in words is "two hundred thirteen million, seven hundred forty thousand, six hundred fifty-six".