212655870 has 96 divisors (see below), whose sum is σ = 635102208. Its totient is φ = 48360384.

The previous prime is 212655857. The next prime is 212655893. The reversal of 212655870 is 78556212.

It is a happy number.

212655870 is a `hidden beast` number, since 2 + 12 + 65 + 587 + 0 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 142267 + ... + 143753.

It is an arithmetic number, because the mean of its divisors is an integer number (6615648).

Almost surely, 2^212655870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212655870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (317551104).

212655870 is an abundant number, since it is smaller than the sum of its proper divisors (422446338).

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

212655870 is a wasteful number, since it uses less digits than its factorization.

212655870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1734 (or 1731 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The square root of 212655870 is about 14582.7250539808. The cubic root of 212655870 is about 596.8874647946.

The spelling of 212655870 in words is "two hundred twelve million, six hundred fifty-five thousand, eight hundred seventy".