212788780 has 12 divisors (see below), whose sum is σ = 446856480. Its totient is φ = 85115504.

The previous prime is 212788727. The next prime is 212788783. The reversal of 212788780 is 87887212.

It is not an unprimeable number, because it can be changed into a prime (212788783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5319700 + ... + 5319739.

It is an arithmetic number, because the mean of its divisors is an integer number (37238040).

Almost surely, 2^212788780 is an apocalyptic number.

212788780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212788780 is an abundant number, since it is smaller than the sum of its proper divisors (234067700).

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

212788780 is a wasteful number, since it uses less digits than its factorization.

212788780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10639448 (or 10639446 counting only the distinct ones).

The product of its (nonzero) digits is 100352, while the sum is 43.

The square root of 212788780 is about 14587.2814465205. The cubic root of 212788780 is about 597.0117905281.

The spelling of 212788780 in words is "two hundred twelve million, seven hundred eighty-eight thousand, seven hundred eighty".