212536640 has 28 divisors (see below), whose sum is σ = 506103636. Its totient is φ = 85014528.

The previous prime is 212536613. The next prime is 212536657. The reversal of 212536640 is 46635212.

It can be written as a sum of positive squares in 2 ways, for example, as 108659776 + 103876864 = 10424^2 + 10192^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 331769 + ... + 332408.

Almost surely, 2^212536640 is an apocalyptic number.

212536640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212536640 is an abundant number, since it is smaller than the sum of its proper divisors (293566996).

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

212536640 is an equidigital number, since it uses as much as digits as its factorization.

212536640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 664194 (or 664184 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 212536640 is about 14578.6364245769. The cubic root of 212536640 is about 596.7758914233.

The spelling of 212536640 in words is "two hundred twelve million, five hundred thirty-six thousand, six hundred forty".