207128840 has 32 divisors (see below), whose sum is σ = 466453080. Its totient is φ = 82778112.

The previous prime is 207128839. The next prime is 207128851. The reversal of 207128840 is 48821702.

207128840 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 116079076 + 91049764 = 10774^2 + 9542^2 .

It is a junction number, because it is equal to n+sod(n) for n = 207128797 and 207128806.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78584 + ... + 81176.

Almost surely, 2^207128840 is an apocalyptic number.

207128840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

207128840 is an abundant number, since it is smaller than the sum of its proper divisors (259324240).

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

207128840 is a wasteful number, since it uses less digits than its factorization.

207128840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4601 (or 4597 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 207128840 is about 14391.9713729565. The cubic root of 207128840 is about 591.6708740912.

The spelling of 207128840 in words is "two hundred seven million, one hundred twenty-eight thousand, eight hundred forty".