211072660 has 12 divisors (see below), whose sum is σ = 443252628. Its totient is φ = 84429056.

The previous prime is 211072657. The next prime is 211072703. The reversal of 211072660 is 66270112.

It can be written as a sum of positive squares in 2 ways, for example, as 43007364 + 168065296 = 6558^2 + 12964^2 .

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 5276797 + ... + 5276836.

It is an arithmetic number, because the mean of its divisors is an integer number (36937719).

Almost surely, 2^211072660 is an apocalyptic number.

211072660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211072660 is an abundant number, since it is smaller than the sum of its proper divisors (232179968).

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

211072660 is a wasteful number, since it uses less digits than its factorization.

211072660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10553642 (or 10553640 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 211072660 is about 14528.3398913985. The cubic root of 211072660 is about 595.4025099351.

The spelling of 211072660 in words is "two hundred eleven million, seventy-two thousand, six hundred sixty".