821577796 has 24 divisors (see below), whose sum is σ = 1554860160. Its totient is φ = 377597472.

The previous prime is 821577793. The next prime is 821577797. The reversal of 821577796 is 697775128.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is not an unprimeable number, because it can be changed into a prime (821577793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20626 + ... + 45481.

It is an arithmetic number, because the mean of its divisors is an integer number (64785840).

Almost surely, 2^821577796 is an apocalyptic number.

It is an amenable number.

821577796 is a deficient number, since it is larger than the sum of its proper divisors (733282364).

821577796 is a wasteful number, since it uses less digits than its factorization.

821577796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66363 (or 66361 counting only the distinct ones).

The product of its digits is 1481760, while the sum is 52.

The square root of 821577796 is about 28663.1784001705. The cubic root of 821577796 is about 936.5901035148.

The spelling of 821577796 in words is "eight hundred twenty-one million, five hundred seventy-seven thousand, seven hundred ninety-six".