821795856 has 60 divisors (see below), whose sum is σ = 2469587472. Its totient is φ = 234798144.

The previous prime is 821795839. The next prime is 821795857. The reversal of 821795856 is 658597128.

It is a junction number, because it is equal to n+sod(n) for n = 821795799 and 821795808.

It is not an unprimeable number, because it can be changed into a prime (821795857) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 172350 + ... + 177053.

Almost surely, 2^821795856 is an apocalyptic number.

It is an amenable number.

821795856 is an abundant number, since it is smaller than the sum of its proper divisors (1647791616).

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

821795856 is a wasteful number, since it uses less digits than its factorization.

821795856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349428 (or 349415 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 51.

The square root of 821795856 is about 28666.9819827620. The cubic root of 821795856 is about 936.6729582255.

The spelling of 821795856 in words is "eight hundred twenty-one million, seven hundred ninety-five thousand, eight hundred fifty-six".