821752868 has 24 divisors (see below), whose sum is σ = 1523890872. Its totient is φ = 386394624.

The previous prime is 821752829. The next prime is 821752879. The reversal of 821752868 is 868257128.

821752868 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 703204324 + 118548544 = 26518^2 + 10888^2 .

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, 94646 + ... + 102962.

It is an arithmetic number, because the mean of its divisors is an integer number (63495453).

Almost surely, 2^821752868 is an apocalyptic number.

It is an amenable number.

821752868 is a deficient number, since it is larger than the sum of its proper divisors (702138004).

821752868 is a wasteful number, since it uses less digits than its factorization.

821752868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9791 (or 9789 counting only the distinct ones).

The product of its digits is 430080, while the sum is 47.

The square root of 821752868 is about 28666.2321905060. The cubic root of 821752868 is about 936.6566255402.

The spelling of 821752868 in words is "eight hundred twenty-one million, seven hundred fifty-two thousand, eight hundred sixty-eight".