212177668 has 36 divisors (see below), whose sum is σ = 390893580. Its totient is φ = 100762816.

The previous prime is 212177653. The next prime is 212177681. The reversal of 212177668 is 866771212.

It can be written as a sum of positive squares in 2 ways, for example, as 194267844 + 17909824 = 13938^2 + 4232^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 212177668.

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 11 ways as a sum of consecutive naturals, for example, 416598 + ... + 417106.

It is an arithmetic number, because the mean of its divisors is an integer number (10858155).

Almost surely, 2^212177668 is an apocalyptic number.

It is an amenable number.

212177668 is a deficient number, since it is larger than the sum of its proper divisors (178715912).

212177668 is a wasteful number, since it uses less digits than its factorization.

212177668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 756 (or 731 counting only the distinct ones).

The product of its digits is 56448, while the sum is 40.

The square root of 212177668 is about 14566.3196449893. The cubic root of 212177668 is about 596.4397194941.

The spelling of 212177668 in words is "two hundred twelve million, one hundred seventy-seven thousand, six hundred sixty-eight".