801390820 has 12 divisors (see below), whose sum is σ = 1682920764. Its totient is φ = 320556320.

The previous prime is 801390803. The next prime is 801390839. The reversal of 801390820 is 28093108.

It can be written as a sum of positive squares in 2 ways, for example, as 514291684 + 287099136 = 22678^2 + 16944^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20034751 + ... + 20034790.

It is an arithmetic number, because the mean of its divisors is an integer number (140243397).

Almost surely, 2^801390820 is an apocalyptic number.

It is an amenable number.

801390820 is an abundant number, since it is smaller than the sum of its proper divisors (881529944).

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

801390820 is a wasteful number, since it uses less digits than its factorization.

801390820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40069550 (or 40069548 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 801390820 is about 28308.8470270338. The cubic root of 801390820 is about 928.8554231482.

The spelling of 801390820 in words is "eight hundred one million, three hundred ninety thousand, eight hundred twenty".