820803572 has 24 divisors (see below), whose sum is σ = 1525893600. Its totient is φ = 385230816.

The previous prime is 820803569. The next prime is 820803583. The reversal of 820803572 is 275308028.

It is a happy 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, 41258 + ... + 57825.

It is an arithmetic number, because the mean of its divisors is an integer number (63578900).

Almost surely, 2^820803572 is an apocalyptic number.

It is an amenable number.

820803572 is a deficient number, since it is larger than the sum of its proper divisors (705090028).

820803572 is a wasteful number, since it uses less digits than its factorization.

820803572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99215 (or 99213 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 820803572 is about 28649.6696665075. The cubic root of 820803572 is about 936.2958086277.

The spelling of 820803572 in words is "eight hundred twenty million, eight hundred three thousand, five hundred seventy-two".