212745630 has 32 divisors (see below), whose sum is σ = 532790784. Its totient is φ = 54265376.

The previous prime is 212745587. The next prime is 212745707. The reversal of 212745630 is 36547212.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 153474 + ... + 154853.

It is an arithmetic number, because the mean of its divisors is an integer number (16649712).

Almost surely, 2^212745630 is an apocalyptic number.

212745630 is an abundant number, since it is smaller than the sum of its proper divisors (320045154).

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

212745630 is a wasteful number, since it uses less digits than its factorization.

212745630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308360.

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 212745630 is about 14585.8023433749. The cubic root of 212745630 is about 596.9714331367.

The spelling of 212745630 in words is "two hundred twelve million, seven hundred forty-five thousand, six hundred thirty".