212731064 has 64 divisors (see below), whose sum is σ = 519825600. Its totient is φ = 79202304.

The previous prime is 212731063. The next prime is 212731091. The reversal of 212731064 is 460137212.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212731061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3782 + ... + 20970.

It is an arithmetic number, because the mean of its divisors is an integer number (8122275).

Almost surely, 2^212731064 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 212731064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (259912800).

212731064 is an abundant number, since it is smaller than the sum of its proper divisors (307094536).

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

212731064 is a wasteful number, since it uses less digits than its factorization.

212731064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17232 (or 17228 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 212731064 is about 14585.3030136504. The cubic root of 212731064 is about 596.9578085962.

Adding to 212731064 its reverse (460137212), we get a palindrome (672868276).

The spelling of 212731064 in words is "two hundred twelve million, seven hundred thirty-one thousand, sixty-four".