206478730 has 8 divisors (see below), whose sum is σ = 371661732. Its totient is φ = 82591488.

The previous prime is 206478703. The next prime is 206478731. The reversal of 206478730 is 37874602.

206478730 is digitally balanced in base 2, 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 2 ways, for example, as 192182769 + 14295961 = 13863^2 + 3781^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 206478730.

It is not an unprimeable number, because it can be changed into a prime (206478731) 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, 10323927 + ... + 10323946.

Almost surely, 2^206478730 is an apocalyptic number.

206478730 is a deficient number, since it is larger than the sum of its proper divisors (165183002).

206478730 is a wasteful number, since it uses less digits than its factorization.

206478730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20647880.

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 206478730 is about 14369.3677661893. The cubic root of 206478730 is about 591.0512045709.

The spelling of 206478730 in words is "two hundred six million, four hundred seventy-eight thousand, seven hundred thirty".