821272630 has 32 divisors (see below), whose sum is σ = 1526887584. Its totient is φ = 317880576.

The previous prime is 821272603. The next prime is 821272631. The reversal of 821272630 is 36272128.

It is a junction number, because it is equal to n+sod(n) for n = 821272592 and 821272601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821272631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28077 + ... + 49303.

It is an arithmetic number, because the mean of its divisors is an integer number (47715237).

Almost surely, 2^821272630 is an apocalyptic number.

821272630 is a deficient number, since it is larger than the sum of its proper divisors (705614954).

821272630 is a wasteful number, since it uses less digits than its factorization.

821272630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21360.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 821272630 is about 28657.8545952065. The cubic root of 821272630 is about 936.4741271370.

The spelling of 821272630 in words is "eight hundred twenty-one million, two hundred seventy-two thousand, six hundred thirty".