821876136 has 64 divisors (see below), whose sum is σ = 2120947200. Its totient is φ = 265265088.

The previous prime is 821876131. The next prime is 821876161. The reversal of 821876136 is 631678128.

It is not an unprimeable number, because it can be changed into a prime (821876131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90541 + ... + 99203.

It is an arithmetic number, because the mean of its divisors is an integer number (33139800).

Almost surely, 2^821876136 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 821876136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1060473600).

821876136 is an abundant number, since it is smaller than the sum of its proper divisors (1299071064).

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

821876136 is a wasteful number, since it uses less digits than its factorization.

821876136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8798 (or 8794 counting only the distinct ones).

The product of its digits is 96768, while the sum is 42.

The square root of 821876136 is about 28668.3821657240. The cubic root of 821876136 is about 936.7034579561.

The spelling of 821876136 in words is "eight hundred twenty-one million, eight hundred seventy-six thousand, one hundred thirty-six".