212987808 has 72 divisors (see below), whose sum is σ = 660756096. Its totient is φ = 64540800.

The previous prime is 212987771. The next prime is 212987809. The reversal of 212987808 is 808789212.

It is a happy number.

212987808 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (72).

It is not an unprimeable number, because it can be changed into a prime (212987809) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30448 + ... + 36783.

It is an arithmetic number, because the mean of its divisors is an integer number (9177168).

Almost surely, 2^212987808 is an apocalyptic number.

It is an amenable number.

212987808 is an abundant number, since it is smaller than the sum of its proper divisors (447768288).

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

212987808 is a wasteful number, since it uses less digits than its factorization.

212987808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67258 (or 67247 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The square root of 212987808 is about 14594.1018223116. The cubic root of 212987808 is about 597.1978671247.

The spelling of 212987808 in words is "two hundred twelve million, nine hundred eighty-seven thousand, eight hundred eight".