212616378 has 24 divisors (see below), whose sum is σ = 496105428. Its totient is φ = 65420352.

The previous prime is 212616359. The next prime is 212616389. The reversal of 212616378 is 873616212.

212616378 is a `hidden beast` number, since 2 + 1 + 2 + 616 + 37 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 212488929 + 127449 = 14577^2 + 357^2 .

It is a Curzon number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 454075 + ... + 454542.

Almost surely, 2^212616378 is an apocalyptic number.

212616378 is an abundant number, since it is smaller than the sum of its proper divisors (283489050).

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

212616378 is a wasteful number, since it uses less digits than its factorization.

212616378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 908638 (or 908635 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 212616378 is about 14581.3709232020. The cubic root of 212616378 is about 596.8505134843.

The spelling of 212616378 in words is "two hundred twelve million, six hundred sixteen thousand, three hundred seventy-eight".