844320820 has 48 divisors (see below), whose sum is σ = 2050812288. Its totient is φ = 285989760.

The previous prime is 844320817. The next prime is 844320859. The reversal of 844320820 is 28023448.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24711 + ... + 47950.

It is an arithmetic number, because the mean of its divisors is an integer number (42725256).

Almost surely, 2^844320820 is an apocalyptic number.

It is an amenable number.

844320820 is an abundant number, since it is smaller than the sum of its proper divisors (1206491468).

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

844320820 is a wasteful number, since it uses less digits than its factorization.

844320820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72760 (or 72758 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 31.

The square root of 844320820 is about 29057.1991079663. The cubic root of 844320820 is about 945.1538321652.

The spelling of 844320820 in words is "eight hundred forty-four million, three hundred twenty thousand, eight hundred twenty".