212880906 has 128 divisors (see below), whose sum is σ = 574341120. Its totient is φ = 57153600.

The previous prime is 212880859. The next prime is 212880923. The reversal of 212880906 is 609088212.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 433321 + ... + 433811.

It is an arithmetic number, because the mean of its divisors is an integer number (4487040).

Almost surely, 2^212880906 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212880906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (287170560).

212880906 is an abundant number, since it is smaller than the sum of its proper divisors (361460214).

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

212880906 is a wasteful number, since it uses less digits than its factorization.

212880906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577 (or 571 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 212880906 is about 14590.4388556342. The cubic root of 212880906 is about 597.0979360049.

The spelling of 212880906 in words is "two hundred twelve million, eight hundred eighty thousand, nine hundred six".