213644990 has 16 divisors (see below), whose sum is σ = 414142848. Its totient is φ = 78884256.

The previous prime is 213644989. The next prime is 213645011. The reversal of 213644990 is 99446312.

213644990 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 821582 + ... + 821841.

It is an arithmetic number, because the mean of its divisors is an integer number (25883928).

Almost surely, 2^213644990 is an apocalyptic number.

213644990 is a deficient number, since it is larger than the sum of its proper divisors (200497858).

213644990 is a wasteful number, since it uses less digits than its factorization.

213644990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1643443.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 213644990 is about 14616.5998098053. The cubic root of 213644990 is about 597.8114620606.

The spelling of 213644990 in words is "two hundred thirteen million, six hundred forty-four thousand, nine hundred ninety".