821801728092 has 24 divisors (see below), whose sum is σ = 1969362700816. Its totient is φ = 266530290048.

The previous prime is 821801728079. The next prime is 821801728103. The reversal of 821801728092 is 290827108128.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 925451953 + ... + 925452840.

Almost surely, 2^821801728092 is an apocalyptic number.

It is an amenable number.

821801728092 is an abundant number, since it is smaller than the sum of its proper divisors (1147560972724).

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

821801728092 is a wasteful number, since it uses less digits than its factorization.

821801728092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1850904837 (or 1850904835 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 48.

The spelling of 821801728092 in words is "eight hundred twenty-one billion, eight hundred one million, seven hundred twenty-eight thousand, ninety-two".