821286054 has 48 divisors (see below), whose sum is σ = 1868805120. Its totient is φ = 270284040.

The previous prime is 821286049. The next prime is 821286071. The reversal of 821286054 is 450682128.

821286054 is a `hidden beast` number, since 8 + 21 + 28 + 605 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27699 + ... + 49089.

It is an arithmetic number, because the mean of its divisors is an integer number (38933440).

Almost surely, 2^821286054 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 821286054, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (934402560).

821286054 is an abundant number, since it is smaller than the sum of its proper divisors (1047519066).

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

821286054 is a wasteful number, since it uses less digits than its factorization.

821286054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21487 (or 21475 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 821286054 is about 28658.0888057805. The cubic root of 821286054 is about 936.4792294460.

The spelling of 821286054 in words is "eight hundred twenty-one million, two hundred eighty-six thousand, fifty-four".