213512868 has 48 divisors (see below), whose sum is σ = 555730560. Its totient is φ = 70890912.

The previous prime is 213512863. The next prime is 213512879. The reversal of 213512868 is 868215312.

It is a happy number.

213512868 is a `hidden beast` number, since 21 + 351 + 286 + 8 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213512863) 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, 24646 + ... + 32162.

It is an arithmetic number, because the mean of its divisors is an integer number (11577720).

Almost surely, 2^213512868 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 213512868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (277865280).

213512868 is an abundant number, since it is smaller than the sum of its proper divisors (342217692).

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

213512868 is a wasteful number, since it uses less digits than its factorization.

213512868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7793 (or 7785 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 213512868 is about 14612.0795234628. The cubic root of 213512868 is about 597.6882041062.

The spelling of 213512868 in words is "two hundred thirteen million, five hundred twelve thousand, eight hundred sixty-eight".