821630606 has 4 divisors (see below), whose sum is σ = 1232445912. Its totient is φ = 410815302.

The previous prime is 821630591. The next prime is 821630609. The reversal of 821630606 is 606036128.

821630606 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821630609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 205407650 + ... + 205407653.

It is an arithmetic number, because the mean of its divisors is an integer number (308111478).

Almost surely, 2^821630606 is an apocalyptic number.

821630606 is a deficient number, since it is larger than the sum of its proper divisors (410815306).

821630606 is a wasteful number, since it uses less digits than its factorization.

821630606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410815305.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 821630606 is about 28664.0996021155. The cubic root of 821630606 is about 936.6101707009.

The spelling of 821630606 in words is "eight hundred twenty-one million, six hundred thirty thousand, six hundred six".