820722894 has 16 divisors (see below), whose sum is σ = 1642809168. Its totient is φ = 273347072.

The previous prime is 820722887. The next prime is 820722941. The reversal of 820722894 is 498227028.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48897 + ... + 63500.

It is an arithmetic number, because the mean of its divisors is an integer number (102675573).

Almost surely, 2^820722894 is an apocalyptic number.

820722894 is an abundant number, since it is smaller than the sum of its proper divisors (822086274).

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

820722894 is a wasteful number, since it uses less digits than its factorization.

820722894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113619.

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 820722894 is about 28648.2616226535. The cubic root of 820722894 is about 936.2651309881.

The spelling of 820722894 in words is "eight hundred twenty million, seven hundred twenty-two thousand, eight hundred ninety-four".