209892469768 has 16 divisors (see below), whose sum is σ = 393559000380. Its totient is φ = 104943403008.

The previous prime is 209892469757. The next prime is 209892469781. The reversal of 209892469768 is 867964298902.

It can be written as a sum of positive squares in 2 ways, for example, as 173837295844 + 36055173924 = 416938^2 + 189882^2 .

It is a junction number, because it is equal to n+sod(n) for n = 209892469697 and 209892469706.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20505 + ... + 648232.

Almost surely, 2^209892469768 is an apocalyptic number.

It is an amenable number.

209892469768 is a deficient number, since it is larger than the sum of its proper divisors (183666530612).

209892469768 is a wasteful number, since it uses less digits than its factorization.

209892469768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707976 (or 707972 counting only the distinct ones).

The product of its (nonzero) digits is 188116992, while the sum is 70.

The spelling of 209892469768 in words is "two hundred nine billion, eight hundred ninety-two million, four hundred sixty-nine thousand, seven hundred sixty-eight".