212644640 has 48 divisors (see below), whose sum is σ = 541022328. Its totient is φ = 78514176.

The previous prime is 212644613. The next prime is 212644657. The reversal of 212644640 is 46446212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 128958736 + 83685904 = 11356^2 + 9148^2 .

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, 49037 + ... + 53196.

Almost surely, 2^212644640 is an apocalyptic number.

212644640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212644640 is an abundant number, since it is smaller than the sum of its proper divisors (328377688).

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

212644640 is a wasteful number, since it uses less digits than its factorization.

212644640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102261 (or 102253 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 29.

The square root of 212644640 is about 14582.3400042654. The cubic root of 212644640 is about 596.8769577341.

The spelling of 212644640 in words is "two hundred twelve million, six hundred forty-four thousand, six hundred forty".