209420568 has 48 divisors (see below), whose sum is σ = 648208080. Its totient is φ = 59834304.

The previous prime is 209420551. The next prime is 209420581. The reversal of 209420568 is 865024902.

It is a happy number.

209420568 is a `hidden beast` number, since 2 + 0 + 94 + 2 + 0 + 568 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 207255 + ... + 208262.

It is an arithmetic number, because the mean of its divisors is an integer number (13504335).

Almost surely, 2^209420568 is an apocalyptic number.

209420568 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

209420568 is an abundant number, since it is smaller than the sum of its proper divisors (438787512).

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

209420568 is a wasteful number, since it uses less digits than its factorization.

209420568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415536 (or 415529 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 209420568 is about 14471.3706330810. The cubic root of 209420568 is about 593.8450093871.

The spelling of 209420568 in words is "two hundred nine million, four hundred twenty thousand, five hundred sixty-eight".