209442628 has 12 divisors (see below), whose sum is σ = 369887980. Its totient is φ = 103760352.

The previous prime is 209442617. The next prime is 209442671. The reversal of 209442628 is 826244902.

It can be written as a sum of positive squares in 2 ways, for example, as 145154304 + 64288324 = 12048^2 + 8018^2 .

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

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, 239751 + ... + 240622.

Almost surely, 2^209442628 is an apocalyptic number.

It is an amenable number.

209442628 is a deficient number, since it is larger than the sum of its proper divisors (160445352).

209442628 is a wasteful number, since it uses less digits than its factorization.

209442628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480486 (or 480484 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 37.

The square root of 209442628 is about 14472.1328075719. The cubic root of 209442628 is about 593.8658601900.

The spelling of 209442628 in words is "two hundred nine million, four hundred forty-two thousand, six hundred twenty-eight".