206389280 has 24 divisors (see below), whose sum is σ = 487595052. Its totient is φ = 82555648.

The previous prime is 206389277. The next prime is 206389283. The reversal of 206389280 is 82983602.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (206389277) and next prime (206389283).

It can be written as a sum of positive squares in 2 ways, for example, as 205865104 + 524176 = 14348^2 + 724^2 .

It is not an unprimeable number, because it can be changed into a prime (206389283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 644807 + ... + 645126.

Almost surely, 2^206389280 is an apocalyptic number.

206389280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206389280 is an abundant number, since it is smaller than the sum of its proper divisors (281205772).

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

206389280 is a wasteful number, since it uses less digits than its factorization.

206389280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1289948 (or 1289940 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 206389280 is about 14366.2549051588. The cubic root of 206389280 is about 590.9658411912.

The spelling of 206389280 in words is "two hundred six million, three hundred eighty-nine thousand, two hundred eighty".