206661078 has 64 divisors (see below), whose sum is σ = 523696320. Its totient is φ = 59844096.

The previous prime is 206660983. The next prime is 206661079. The reversal of 206661078 is 870166602.

It is a happy number.

206661078 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206661079) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3276 + ... + 20592.

It is an arithmetic number, because the mean of its divisors is an integer number (8182755).

Almost surely, 2^206661078 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 206661078, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (261848160).

206661078 is an abundant number, since it is smaller than the sum of its proper divisors (317035242).

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

206661078 is a wasteful number, since it uses less digits than its factorization.

206661078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17358 (or 17352 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 206661078 is about 14375.7113910930. The cubic root of 206661078 is about 591.2251454792.

The spelling of 206661078 in words is "two hundred six million, six hundred sixty-one thousand, seventy-eight".