212564660 has 96 divisors (see below), whose sum is σ = 563576832. Its totient is φ = 65416320.

The previous prime is 212564659. The next prime is 212564683. The reversal of 212564660 is 66465212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 126989 + ... + 128651.

It is an arithmetic number, because the mean of its divisors is an integer number (5870592).

Almost surely, 2^212564660 is an apocalyptic number.

212564660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212564660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (281788416).

212564660 is an abundant number, since it is smaller than the sum of its proper divisors (351012172).

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

212564660 is a wasteful number, since it uses less digits than its factorization.

212564660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1773 (or 1771 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 212564660 is about 14579.5973881311. The cubic root of 212564660 is about 596.8021158047.

The spelling of 212564660 in words is "two hundred twelve million, five hundred sixty-four thousand, six hundred sixty".