209326628 has 36 divisors (see below), whose sum is σ = 427084812. Its totient is φ = 89510400.

The previous prime is 209326597. The next prime is 209326639. The reversal of 209326628 is 826623902.

It can be written as a sum of positive squares in 2 ways, for example, as 73650724 + 135675904 = 8582^2 + 11648^2 .

It is a junction number, because it is equal to n+sod(n) for n = 209326591 and 209326600.

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, 115328 + ... + 117128.

It is an arithmetic number, because the mean of its divisors is an integer number (11863467).

Almost surely, 2^209326628 is an apocalyptic number.

209326628 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

209326628 is an abundant number, since it is smaller than the sum of its proper divisors (217758184).

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

209326628 is a wasteful number, since it uses less digits than its factorization.

209326628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2412 (or 2403 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 209326628 is about 14468.1245501965. The cubic root of 209326628 is about 593.7562022178.

The spelling of 209326628 in words is "two hundred nine million, three hundred twenty-six thousand, six hundred twenty-eight".