206638464 has 32 divisors (see below), whose sum is σ = 548884440. Its totient is φ = 68879360.

The previous prime is 206638459. The next prime is 206638477. The reversal of 206638464 is 464836602.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 268677 + ... + 269444.

Almost surely, 2^206638464 is an apocalyptic number.

206638464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

206638464 is an abundant number, since it is smaller than the sum of its proper divisors (342245976).

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

206638464 is an equidigital number, since it uses as much as digits as its factorization.

206638464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538138 (or 538126 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 39.

The square root of 206638464 is about 14374.9248345861. The cubic root of 206638464 is about 591.2035796490.

The spelling of 206638464 in words is "two hundred six million, six hundred thirty-eight thousand, four hundred sixty-four".