821917068 has 48 divisors (see below), whose sum is σ = 2205262080. Its totient is φ = 233388864.

The previous prime is 821917049. The next prime is 821917079. The reversal of 821917068 is 860719128.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16323 + ... + 43706.

It is an arithmetic number, because the mean of its divisors is an integer number (45942960).

Almost surely, 2^821917068 is an apocalyptic number.

It is an amenable number.

821917068 is an abundant number, since it is smaller than the sum of its proper divisors (1383345012).

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

821917068 is a wasteful number, since it uses less digits than its factorization.

821917068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60206 (or 60204 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 42.

The square root of 821917068 is about 28669.0960443471. The cubic root of 821917068 is about 936.7190079511.

The spelling of 821917068 in words is "eight hundred twenty-one million, nine hundred seventeen thousand, sixty-eight".