821229072 has 40 divisors (see below), whose sum is σ = 2129607744. Its totient is φ = 272697984.

The previous prime is 821229067. The next prime is 821229107. The reversal of 821229072 is 270922128.

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, 19903 + ... + 45150.

Almost surely, 2^821229072 is an apocalyptic number.

It is an amenable number.

821229072 is an abundant number, since it is smaller than the sum of its proper divisors (1308378672).

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

821229072 is a wasteful number, since it uses less digits than its factorization.

821229072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65327 (or 65321 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 821229072 is about 28657.0946189595. The cubic root of 821229072 is about 936.4575708561.

The spelling of 821229072 in words is "eight hundred twenty-one million, two hundred twenty-nine thousand, seventy-two".