209872071774 has 48 divisors (see below), whose sum is σ = 465372507600. Its totient is φ = 68337886848.

The previous prime is 209872071769. The next prime is 209872071803. The reversal of 209872071774 is 477170278902.

It is a super-2 number, since 2×209872071774² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 209872071774.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 656229 + ... + 922160.

It is an arithmetic number, because the mean of its divisors is an integer number (9695260575).

Almost surely, 2^209872071774 is an apocalyptic number.

209872071774 is an abundant number, since it is smaller than the sum of its proper divisors (255500435826).

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

209872071774 is a wasteful number, since it uses less digits than its factorization.

209872071774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1578569 (or 1578566 counting only the distinct ones).

The product of its (nonzero) digits is 2765952, while the sum is 54.

The spelling of 209872071774 in words is "two hundred nine billion, eight hundred seventy-two million, seventy-one thousand, seven hundred seventy-four".