212687408 has 80 divisors (see below), whose sum is σ = 452542464. Its totient is φ = 96445440.

The previous prime is 212687407. The next prime is 212687437. The reversal of 212687408 is 804786212.

It is not an unprimeable number, because it can be changed into a prime (212687407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1623503 + ... + 1623633.

Almost surely, 2^212687408 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 212687408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (226271232).

212687408 is an abundant number, since it is smaller than the sum of its proper divisors (239855056).

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

212687408 is a wasteful number, since it uses less digits than its factorization.

212687408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330 (or 324 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 212687408 is about 14583.8063618522. The cubic root of 212687408 is about 596.9169705344.

The spelling of 212687408 in words is "two hundred twelve million, six hundred eighty-seven thousand, four hundred eight".