209422991028 has 48 divisors (see below), whose sum is σ = 517509941760. Its totient is φ = 65775936864.

The previous prime is 209422991003. The next prime is 209422991179. The reversal of 209422991028 is 820199224902.

It is a super-2 number, since 2×209422991028² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5644038 + ... + 5681021.

It is an arithmetic number, because the mean of its divisors is an integer number (10781457120).

Almost surely, 2^209422991028 is an apocalyptic number.

It is an amenable number.

209422991028 is an abundant number, since it is smaller than the sum of its proper divisors (308086950732).

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

209422991028 is a wasteful number, since it uses less digits than its factorization.

209422991028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11325156 (or 11325154 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 48.

The spelling of 209422991028 in words is "two hundred nine billion, four hundred twenty-two million, nine hundred ninety-one thousand, twenty-eight".