213788438892 has 144 divisors (see below), whose sum is σ = 641947767552. Its totient is φ = 58715280000.

The previous prime is 213788438861. The next prime is 213788438911. The reversal of 213788438892 is 298834887312.

213788438892 is a `hidden beast` number, since 2 + 1 + 37 + 88 + 438 + 8 + 92 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 635767 + ... + 912017.

It is an arithmetic number, because the mean of its divisors is an integer number (4457970608).

Almost surely, 2^213788438892 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 213788438892, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (320973883776).

213788438892 is an abundant number, since it is smaller than the sum of its proper divisors (428159328660).

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

213788438892 is a wasteful number, since it uses less digits than its factorization.

213788438892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276388 (or 276383 counting only the distinct ones).

The product of its digits is 37158912, while the sum is 63.

The spelling of 213788438892 in words is "two hundred thirteen billion, seven hundred eighty-eight million, four hundred thirty-eight thousand, eight hundred ninety-two".