206616390 has 32 divisors (see below), whose sum is σ = 502868736. Its totient is φ = 54321120.

The previous prime is 206616359. The next prime is 206616433. The reversal of 206616390 is 93616602.

It is a happy number.

It is a super-5 number, since 5×206616390⁵ (a number of 43 digits) contains 55555 as substring. Note that it is a super-d number also for d = 3.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46372 + ... + 50631.

It is an arithmetic number, because the mean of its divisors is an integer number (15714648).

Almost surely, 2^206616390 is an apocalyptic number.

206616390 is an abundant number, since it is smaller than the sum of its proper divisors (296252346).

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

206616390 is a wasteful number, since it uses less digits than its factorization.

206616390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97084.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 206616390 is about 14374.1570187611. The cubic root of 206616390 is about 591.1825272720.

The spelling of 206616390 in words is "two hundred six million, six hundred sixteen thousand, three hundred ninety".