206657072 has 20 divisors (see below), whose sum is σ = 421472280. Its totient is φ = 97890048.

The previous prime is 206657069. The next prime is 206657089. The reversal of 206657072 is 270756602.

It is a happy number.

It is a super-2 number, since 2×206657072² = 85414290815226368, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 339593 + ... + 340200.

It is an arithmetic number, because the mean of its divisors is an integer number (21073614).

Almost surely, 2^206657072 is an apocalyptic number.

It is an amenable number.

206657072 is an abundant number, since it is smaller than the sum of its proper divisors (214815208).

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

206657072 is a wasteful number, since it uses less digits than its factorization.

206657072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679820 (or 679814 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 35.

The square root of 206657072 is about 14375.5720581826. The cubic root of 206657072 is about 591.2213252739.

The spelling of 206657072 in words is "two hundred six million, six hundred fifty-seven thousand, seventy-two".