821375630 has 16 divisors (see below), whose sum is σ = 1493719920. Its totient is φ = 325162752.

The previous prime is 821375557. The next prime is 821375651. The reversal of 821375630 is 36573128.

821375630 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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, 422420 + ... + 424359.

It is an arithmetic number, because the mean of its divisors is an integer number (93357495).

Almost surely, 2^821375630 is an apocalyptic number.

821375630 is a deficient number, since it is larger than the sum of its proper divisors (672344290).

821375630 is a wasteful number, since it uses less digits than its factorization.

821375630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 846883.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 821375630 is about 28659.6516029068. The cubic root of 821375630 is about 936.5132748368.

The spelling of 821375630 in words is "eight hundred twenty-one million, three hundred seventy-five thousand, six hundred thirty".