212728940 has 24 divisors (see below), whose sum is σ = 470243760. Its totient is φ = 80612928.

The previous prime is 212728933. The next prime is 212728961. The reversal of 212728940 is 49827212.

It is a self number, because there is not a number n which added to its sum of digits gives 212728940.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 279527 + ... + 280286.

It is an arithmetic number, because the mean of its divisors is an integer number (19593490).

Almost surely, 2^212728940 is an apocalyptic number.

212728940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212728940 is an abundant number, since it is smaller than the sum of its proper divisors (257514820).

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

212728940 is a wasteful number, since it uses less digits than its factorization.

212728940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559841 (or 559839 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 212728940 is about 14585.2302004459. The cubic root of 212728940 is about 596.9558218270.

The spelling of 212728940 in words is "two hundred twelve million, seven hundred twenty-eight thousand, nine hundred forty".