821698368 has 224 divisors, whose sum is σ = 2401726464. Its totient is φ = 247154688.

The previous prime is 821698351. The next prime is 821698373. The reversal of 821698368 is 863896128.

It is a self number, because there is not a number n which added to its sum of digits gives 821698368.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7679371 + ... + 7679477.

Almost surely, 2^821698368 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 821698368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1200863232).

821698368 is an abundant number, since it is smaller than the sum of its proper divisors (1580028096).

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

821698368 is a wasteful number, since it uses less digits than its factorization.

821698368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229 (or 219 counting only the distinct ones).

The product of its digits is 995328, while the sum is 51.

The square root of 821698368 is about 28665.2815789414. The cubic root of 821698368 is about 936.6359182137.

The spelling of 821698368 in words is "eight hundred twenty-one million, six hundred ninety-eight thousand, three hundred sixty-eight".