206778700 has 72 divisors (see below), whose sum is σ = 469032480. Its totient is φ = 79027200.

The previous prime is 206778697. The next prime is 206778707. The reversal of 206778700 is 7877602.

It is a self number, because there is not a number n which added to its sum of digits gives 206778700.

It is not an unprimeable number, because it can be changed into a prime (206778707) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 327385 + ... + 328015.

It is an arithmetic number, because the mean of its divisors is an integer number (6514340).

Almost surely, 2^206778700 is an apocalyptic number.

206778700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 206778700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (234516240).

206778700 is an abundant number, since it is smaller than the sum of its proper divisors (262253780).

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

206778700 is a wasteful number, since it uses less digits than its factorization.

206778700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 787 (or 780 counting only the distinct ones).

The product of its (nonzero) digits is 32928, while the sum is 37.

The square root of 206778700 is about 14379.8018067010. The cubic root of 206778700 is about 591.3372902780.

The spelling of 206778700 in words is "two hundred six million, seven hundred seventy-eight thousand, seven hundred".