212988660 has 24 divisors (see below), whose sum is σ = 596368416. Its totient is φ = 56796960.

The previous prime is 212988647. The next prime is 212988679. The reversal of 212988660 is 66889212.

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, 1774846 + ... + 1774965.

It is an arithmetic number, because the mean of its divisors is an integer number (24848684).

Almost surely, 2^212988660 is an apocalyptic number.

212988660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212988660 is an abundant number, since it is smaller than the sum of its proper divisors (383379756).

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

212988660 is a wasteful number, since it uses less digits than its factorization.

212988660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3549823 (or 3549821 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 212988660 is about 14594.1310121569. The cubic root of 212988660 is about 597.1986634330.

The spelling of 212988660 in words is "two hundred twelve million, nine hundred eighty-eight thousand, six hundred sixty".