213615990 has 144 divisors (see below), whose sum is σ = 657830160. Its totient is φ = 47940480.

The previous prime is 213615971. The next prime is 213616037. The reversal of 213615990 is 99516312.

213615990 is a `hidden beast` number, since 2 + 1 + 3 + 61 + 599 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 259780 + ... + 260600.

It is an arithmetic number, because the mean of its divisors is an integer number (4568265).

Almost surely, 2^213615990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 213615990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (328915080).

213615990 is an abundant number, since it is smaller than the sum of its proper divisors (444214170).

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

213615990 is a wasteful number, since it uses less digits than its factorization.

213615990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907 (or 897 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 36.

The square root of 213615990 is about 14615.6077533574. The cubic root of 213615990 is about 597.7844120202.

The spelling of 213615990 in words is "two hundred thirteen million, six hundred fifteen thousand, nine hundred ninety".