821608854 has 16 divisors (see below), whose sum is σ = 1792601280. Its totient is φ = 248972360.

The previous prime is 821608763. The next prime is 821608877. The reversal of 821608854 is 458806128.

It is a super-2 number, since 2×821608854² = 1350082217942386632, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

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, 6224244 + ... + 6224375.

It is an arithmetic number, because the mean of its divisors is an integer number (112037580).

Almost surely, 2^821608854 is an apocalyptic number.

821608854 is an abundant number, since it is smaller than the sum of its proper divisors (970992426).

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

821608854 is a wasteful number, since it uses less digits than its factorization.

821608854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12448635.

The product of its (nonzero) digits is 122880, while the sum is 42.

The square root of 821608854 is about 28663.7201702780. The cubic root of 821608854 is about 936.6019052979.

The spelling of 821608854 in words is "eight hundred twenty-one million, six hundred eight thousand, eight hundred fifty-four".