207821056 has 81 divisors (see below), whose sum is σ = 449138851. Its totient is φ = 95952896.

The previous prime is 207821051. The next prime is 207821101. The reversal of 207821056 is 650128702.

The square root of 207821056 is 14416.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 52070656 + 155750400 = 7216^2 + 12480^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (207821051) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3921126 + ... + 3921178.

Almost surely, 2^207821056 is an apocalyptic number.

207821056 is the 14416-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 207821056

207821056 is an abundant number, since it is smaller than the sum of its proper divisors (241317795).

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

207821056 is an frugal number, since it uses more digits than its factorization.

207821056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156 (or 72 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The cubic root of 207821056 is about 592.3292543893.

Adding to 207821056 its reverse (650128702), we get a palindrome (857949758).

The spelling of 207821056 in words is "two hundred seven million, eight hundred twenty-one thousand, fifty-six".